TRUST AGREEMENT


         TRUST AGREEMENT, between MS Structured Asset Corp. (the "Depositor")
and LaSalle Bank National Association (the "Trustee"), made as of the date set
forth in Schedule I attached hereto, which Schedule together with Schedules II
and III attached hereto, are made a part hereof. The terms of the Standard Terms
for Trust Agreements, dated March 5, 2003 (the "Standard Terms") are, except to
the extent otherwise expressly stated, hereby incorporated by reference herein
in their entirety with the same force and effect as though set forth herein.
Capitalized terms used herein and not defined shall have the meanings defined in
the Standard Terms. References to "herein", "hereunder", "this Trust Agreement"
and the like shall include the Schedule I attached hereto and the Standard Terms
so incorporated by reference.

         WHEREAS, the Depositor and the Trustee desire to establish the Trust
identified in Schedule I attached hereto (the "Trust") for the primary purposes
of (i) holding the Underlying Securities, (ii) issuing the Warrants and (iii)
issuing the Units;

         WHEREAS, the Depositor desires that the respective beneficial interests
in the Trust be divided into transferable fractional shares, such shares to be
represented by the Units;

         WHEREAS, the Depositor desires to appoint the Trustee as trustee of the
Trust and the Trustee desires to accept such appointment;

         WHEREAS, the Depositor shall transfer, convey and assign to the Trust
without recourse, and the Trust shall acquire, all of the Depositor's right,
title and interest in and under the Underlying Securities and other property
identified in Schedule II to the Trust Agreement (the "Trust Property"); and

         WHEREAS, the Trust agrees to acquire the Trust Property specified
herein in consideration for Units having an initial Unit Principal Balance and
an initial Notional Amount, as applicable, identified in Schedule I attached
hereto, subject to the terms and conditions specified in the Trust Agreement;

         NOW THEREFORE, the Depositor hereby appoints the Trustee as trustee
hereunder and hereby requests the Trustee to receive the Underlying Securities
from the Depositor and to issue in accordance with the instructions of the
Depositor Units having the terms specified in Schedule I attached hereto, and
the Trustee accepts such appointment and, for itself and its successors and
assigns, hereby declares that it shall hold all the estate, right, title and
interest in any property contributed to the trust account established hereunder
(except property to be applied to the payment or reimbursement of or by the
Trustee for any fees or expenses which under the terms hereof is to be so
applied) in trust for the benefit of all present and future Holders of the
fractional shares of beneficial interest issued hereunder, namely, the
Unitholders, and subject to the terms and provisions hereof.

<PAGE>


         IN WITNESS WHEREOF, each of the undersigned has executed this
instrument as of the date set forth in the Schedule I attached hereto.

                                 LASALLE BANK NATIONAL ASSOCIATION
                                    as Trustee on behalf of the Trust identified
                                    in Schedule I hereto, and not in its
                                    individual capacity



                                 By: /s/ Ann M. Kelly
                                     ------------------------------------
                                     Name:  Ann M. Kelly
                                     Title: Assistant Vice President


                                 LASALLE BANK NATIONAL ASSOCIATION
                                     as Warrant Agent



                                 By: /s/ Ann M. Kelly
                                     ------------------------------------
                                     Name:  Ann M. Kelly
                                     Title: Assistant Vice President



                                 MS STRUCTURED ASSET CORP.



                                 By: /s/ John Kehoe
                                     ------------------------------------
                                     Name:  John Kehoe
                                     Title: Vice President



Attachments: Schedules I, II and III


<PAGE>

                                   Schedule I
                           (Terms of Trust and Units)

Trust:                               SATURNS Trust No. 2003-17

Date of Trust Agreement:             November 25, 2003

Trustee:                             LaSalle Bank National Association

Units:                               The Trust will issue two classes of Units:
                                     the Class A Units and the Class B Units.

Initial Unit Principal Balance
of the Class A Units:                $30,000,000

Initial Notional Amortizing Balance
of the Class B Units:                $4,802,000

Notional                             Amount: For the purposes hereof and of the
                                     Standard Terms incorporated herein, the
                                     Notional Amortizing Balance of the Class B
                                     Units shall be the Notional Amount of the
                                     Class B Units.

Issue Price of Units:                Class A Units: 100%

                                     Class B Units: 100%

Number of Units:                     Class A Units:

                                     1,200,000 (Unit Principal Balance of $25
                                     each)

                                     Class B Units:

                                     4,802 (Initial Notional Amortizing Balance
                                     of $1,000 each)

Swap Agreement:                      Except as provided in this paragraph,
                                     references to a Swap Agreement, a Swap
                                     Counterparty and related references in the
                                     Standard Terms shall be inapplicable. For
                                     purposes of Sections 2.02, 2.03, 3.02(b),
                                     3.02(c), 3.02(f), 3.04, 3.05, 3.08,
                                     4.02(b), 4.02(c), 7.02, 9.03(b), 9.05,
                                     10.02(a)(x), 10.07, 10.12, 10.13, 11.01,
                                     and 12.01 of the Standard Terms as
                                     incorporated herein, use of the term Swap
                                     Counterparty shall be deemed to be use of
                                     the term Warrantholder, use of the term
                                     Swap Agreement shall be deemed to be use of
                                     the term Warrants and use of the term Swap
                                     Termination Payment shall be deemed to be
                                     use of the term Warrant Termination
                                     Payment. The list of sections in this
                                     paragraph shall not be construed as an
                                     exclusive list and where the context so
                                     requires, the preceding sentence may apply
                                     to additional sections of the Standard
                                     Terms.

Call Option / Call Rights:           The Warrants. Each Warrant issued hereunder
                                     represents a Call Option and a Call Right
                                     to purchase $1,000 of Unit Principal
                                     Balance of the Class A Units and the
                                     Initial Notional Amortizing Balance of the
                                     Class B Units corresponding to the
                                     Applicable Class B Equivalent Amount.

Applicable Class B Equivalent
Amount:                              With respect to each call, redemption,
                                     exchange or other transaction, or portion
                                     thereof, the applicable Unit Principal
                                     Balance of Class A Units (x) divided by the
                                     Initial Unit Principal Balance of the Class
                                     A Units and (y) multiplied by the initial
                                     issued number of Class B Units provided
                                     under "Number of Units " above.

Callable Series:                     All Class A Units and Class B Units issued
                                     hereby are subject to Call Options and Call
                                     Rights granted in favor of Warrantholders.
                                     All Class A Units and the Class B Units are
                                     subject to redemption in the event of a
                                     redemption of the Underlying Securities.

                                     Any Unitholder who receives notice that its
                                     Units are being called or redeemed shall
                                     tender the applicable Units to the Trustee
                                     in accordance with such notice. Any Units
                                     subject to call or redemption shall be
                                     automatically canceled, and in the case of
                                     a call, shall be automatically re-issued to
                                     the applicable Warrantholder without
                                     further action by the applicable
                                     Unitholder, Warrantholder, Trustee or any
                                     other person or entity on the date of
                                     redemption or the Call Date, as applicable.
                                     Any failure to so tender any Unit shall
                                     have no force or effect.

                                     Upon exercise of Warrants, the Call Options
                                     and Call Rights represented by such
                                     Warrants shall be automatically canceled.
                                     The certificate representing such Warrants
                                     shall be deemed to represent the
                                     corresponding Class A Units and Class B
                                     Units called by the exercise thereof. The
                                     Trustee shall distribute the Trust Property
                                     to the Warrantholder as specified in
                                     Section 1.2 of Schedule III, and upon such
                                     distribution such Class A Units and Class B
                                     Units shall be canceled.

First Regular Call Date:             As defined in Schedule III.

Minimum Denomination:                Class A Units:

                                     $25 and $25 increments in excess thereof.
                                     Each $25 of Unit Principal Balance is a
                                     Unit.

                                     Class B Units:

                                     $250,000 Initial Notional Amortizing
                                     Balance and $0.01 (one cent) Initial
                                     Notional Amortizing Balance in excess
                                     thereof; provided, however, the minimum
                                     denomination shall not apply to the
                                     following: (1) any exercise of Warrants,
                                     (ii) a transfer to a transferee who will
                                     own, after giving effect to simultaneous
                                     transfers, at least $250,000 Initial
                                     Notional Amortizing Balance of Class B
                                     Units or (iii) in connection with a
                                     transfer of Warrants if the Initial
                                     Notional Amortizing Balance of Class B
                                     Units transferred to the Warrantholder
                                     corresponds to the Applicable Class B
                                     Equivalent Amount.

                                     The Minimum Denominations shall not prevent
                                     transfers of fractional Units if such
                                     fractional Units arise due to exercises of
                                     the Warrants, redemptions of the Underlying
                                     Securities or otherwise by operation of
                                     this Trust Agreement. The Depositor may
                                     waive the Minimum Denomination at any time
                                     in its discretion.

Cut-off Date:                        Closing Date

Closing Date:                        November 25, 2003

Specified Currency:                  United States dollars

Business Day:                        New York, New York and Chicago, Illinois

Interest Rate and Class B Payments:  The right of the Class A Units to accrued
                                     interest is pari passu with the right of
                                     the Class B Units to accrued Class B
                                     Payments from accrued interest on the
                                     Underlying Securities.

                                     Class A Units:

                                     The interest rate on the Class A Units is
                                     7.125% per annum on the basis of a 360 day
                                     year consisting of twelve 30 day months and
                                     is expected to occur on May 15, 2004. This
                                     is currently set to correspond to the
                                     current interest rate of 8.75% on the
                                     Underlying Securities.

                                     Any net change in the ratings of the
                                     Underlying Securities at any time will
                                     result in adjustment of the interest rate
                                     on the Class A Units for the next interest
                                     period. The interest rate payable on the
                                     Class A Units will be increased by 0.20%
                                     for each net rating notch downgrade of the
                                     Underlying Securities by either Moody's or
                                     S&P and decreased by 0.20% for each net
                                     rating notch upgrade of the Underlying
                                     Securities by either Moody's or S&P, but in
                                     no event will the interest rate be reduced
                                     below 6.525%. Any such interest rate
                                     increase or decrease will take effect for
                                     the period beginning immediately after the
                                     Distribution Date following the related net
                                     rating downgrade or upgrade. There is no
                                     limit to the number of times the interest
                                     rate payable on the Class A Units can be
                                     adjusted. Interest will accrue on the Class
                                     A Units on the basis of a 360 day year
                                     consisting of twelve 30 day months or a
                                     30/360 basis.

                                     Class B Payments:

                                     On May 15, 2004, $46.86 ($225,014 / 4,802
                                     Class B Units) is expected to be paid on
                                     each Class B Unit and thereafter $49.61
                                     ($238,250 / 4,802 Class B Units) is
                                     expected to be paid on each Class B Unit on
                                     each Distribution Date thereafter, in each
                                     case from interest received on the
                                     Underlying Securities.

                                     Any net change in the ratings of the
                                     Underlying Securities at any time will
                                     result in adjustment of the payment due on
                                     the Class B Units for the next Distribution
                                     Date period. The payment due on each
                                     Distribution Date after May 15, 2004 will
                                     be increased by $1.56 ($7,500 / 4,802 Class
                                     B Units) for each net rating notch
                                     downgrade by either Moody's of S&P and
                                     decreased by $1.56 ($7,500 / 4,802 Class B
                                     Units) for each net rating notch upgrade by
                                     Moody's or S&P, but in no event will the
                                     payment due be reduced below $44.93
                                     ($215,750 / 4,802 Class B Units) for each
                                     Distribution Date. Any such interest rate
                                     increase or decrease will take effect for
                                     the period beginning immediately after the
                                     Distribution Date following the related net
                                     rating downgrade or upgrade. There is no
                                     limit to the number of times the payment on
                                     the Class B Units can be adjusted. Any such
                                     payment increase or decrease will effect
                                     the payment expected to be paid on each
                                     Class B Unit on each Distribution Date
                                     described above.

Interest Reset Period:               Not Applicable

Rating:                              Class A Units:

                                     Baa2 by Moody's

                                     BBB by S&P

                                     Class B Units:

                                     Baa2 by Moody's

                                     BBB by S&P

Rating Agencies:                     Moody's and S&P

Scheduled Final Distribution Date:   November 15, 2031. The Units will have the
                                     same final maturity as the Underlying
                                     Securities.

Prepayment, Redemption and Call:     The Trust Property is subject to redemption
                                     in accordance with the terms of the
                                     Underlying Securities and as described in
                                     Schedule II. Any such redemption will cause
                                     a redemption of a corresponding portion of
                                     the Class A Units and the Class B Units.

                                     The Class A Units and the Class B Units are
                                     subject to call in accordance with the
                                     Warrant Terms.

                                     If the Warrants are partially exercised or
                                     if there is a partial redemption of the
                                     Underlying Securities, the Trustee will
                                     randomly select Class A Units to be
                                     redeemed in full from the proceeds of such
                                     partial redemption or called in full from
                                     the proceeds of such partial exercise. The
                                     Trustee will also select for call or
                                     redemption an Initial Notional Amortizing
                                     Balance of Class B Units corresponding to
                                     the Applicable Class B Equivalent Amount,
                                     (i) first, from Class B Units held by any
                                     Warrantholder who has exercised its
                                     Warrants (provided that the Warrantholder
                                     as holder of such Class B Units can tender
                                     delivery of such Class B Units to the
                                     Trustee and identify such Class B Units to
                                     the satisfaction of the Trustee as owned by
                                     such Warrantholder), and (ii) then, from
                                     other Class B Units by random selection.

Additional Distribution:             Class A Units:

                                     If a Warrantholder exercises Warrants in
                                     connection with a tender offer for
                                     settlement prior to the First Regular Call
                                     Date, each Class A Unit called in
                                     connection with such exercise shall
                                     receive, in addition to principal and
                                     accrued interest, $1.50 per Class A Unit
                                     from the proceeds of the Warrant exercise.

                                     Class B Payments:

                                     If a Warrantholder exercises Warrants, then
                                     the Class B Units designated to be called
                                     in connection with such exercise shall
                                     receive the corresponding portion of the
                                     Class B Present Value Amount, adjusted for
                                     accrued Class B Payments on the Class B
                                     Units otherwise paid.

                                     If the Underlying Security Issuer redeems
                                     Underlying Securities and the previous
                                     paragraph does not apply, then the Class B
                                     Units designated for a redemption in
                                     connection with such redemption of
                                     Underlying Securities shall receive the
                                     amount with respect to the Class B Present
                                     Value Amount allocated for distribution in
                                     accordance with the applicable provisions
                                     of the Distribution Priorities below, paid
                                     as of the date of such redemption as an
                                     additional distribution.

Class B Present Value Amount:        With respect to a date, an amount equal to
                                     the present value of the Future Class B
                                     Unit Payments for such date in respect of
                                     the Applicable Class B Equivalent Amount,
                                     discounted at a rate of the interest rate
                                     payable on the Underlying Securities at
                                     such date on the basis of a 360 day year
                                     consisting of twelve 30 day months.

Future Class B Unit Payments:        With respect to any date, the Class B
                                     Payments on the Applicable Class B
                                     Equivalent Amount, other than Class B
                                     Payments paid prior to such date, that
                                     would have been payable in the amount and
                                     at the times otherwise specified hereunder
                                     through and including the Scheduled Final
                                     Distribution Date without regard to any
                                     call, redemption or other early termination
                                     of the Class B Units.

Warrant Terms:                       The Warrants represent a Call Option and
                                     Call Rights for the Units pursuant to
                                     Section 5.13 of the Standard Terms.
                                     Schedule III provides additional Warrant
                                     Terms.

Call Date:                           Specified in Schedule III

Call Price:                          Specified in Schedule III

Warrant Agent:                       LaSalle Bank National Association

Warrantholder:                       A holder of Warrants.

Distribution Dates:                  Each May 15 and November 15, or the next
                                     succeeding Business Day if such day is not
                                     a Business Day, commencing May 15, 2004,
                                     and any other date upon which funds are
                                     available (including without limitation
                                     funds available due to a Trust Wind-Up
                                     Event) for distribution in accordance with
                                     the terms hereof.

                                     If any payment with respect to the
                                     Underlying Securities held by the Trust is
                                     not received by the Trustee by 12 noon (New
                                     York City time) on a Distribution Date, the
                                     corresponding distribution on the Units
                                     will not occur until the next Business Day
                                     that the Trust is in receipt of proceeds of
                                     such payment prior to 12 noon, with no
                                     adjustment to the amount distributed or the
                                     Record Date.

Distribution Priorities:             Ordinary Distribution Date Priority: On any
                                     Distribution Date as to which only payments
                                     of interest on the Underlying Securities
                                     have been received, or to the extent such
                                     Distribution Date occurs due to receipt of
                                     payments of interest on the Underlying
                                     Securities, the Trustee shall apply amounts
                                     available:

                                     FIRST, to the payment of any accrued and
                                     unpaid interest on the Class A Units and
                                     any accrued and unpaid Class B Payments pro
                                     rata in proportion to the outstanding
                                     amount of accrued and unpaid interest and
                                     unpaid payments on each, and

                                     SECOND, to the payment of any accrued and
                                     unpaid Expense Administrator's Fee.

                                     Exercise of Warrants Priority:

                                     On any Distribution Date occurring in
                                     connection with an exercise of the
                                     Warrants, or to the extent such
                                     Distribution Date occurs due to the
                                     exercise of Warrants, whether in whole or
                                     in part, whether or not such exercise
                                     results in a Trust Wind-Up Event, the
                                     Trustee shall apply amounts available in
                                     connection with such exercise
                                     (corresponding to the amounts allocable to
                                     the aggregate Corresponding Underlying
                                     Security Amount related to such exercise):

                                     FIRST, to the payment of any accrued and
                                     unpaid interest on the Class A Units and
                                     any accrued and unpaid Class B Payments
                                     being called pro rata in proportion to the
                                     outstanding amount of accrued and unpaid
                                     interest and unpaid payments on each,

                                     SECOND, to the payment of the outstanding
                                     principal on the Class A Units being
                                     called,

                                     THIRD, to the payment of $1.50 on each
                                     Class A Unit called as an Additional
                                     Distribution, if the related Call Date
                                     occurs prior to the First Regular Call Date
                                     and occurs in connection with a tender
                                     offer for the Underlying Securities,

                                     FOURTH, to the payment of the Class B
                                     Present Value Amount with respect to each
                                     Class B Unit called, adjusted for any
                                     accrued Class B Payments paid under Clause
                                     FIRST, as an Additional Distribution on the
                                     Class B Units called,

                                     FIFTH, to the payment of any accrued and
                                     unpaid Expense Administrator's Fee,
                                     including the Expense Administrator
                                     Make-Whole Amount, if any, and

                                     SIXTH, to the exercising Warrantholders, to
                                     the extent such Warrantholders specified or
                                     were deemed to specify that their exercise
                                     was in connection with a redemption of or a
                                     tender offer for the Underlying Securities.

                                     If any exercise of Warrants would result in
                                     the Trust not having sufficient funds to
                                     pay each of items FIRST through FIFTH in
                                     full, notwithstanding any other provision
                                     in this Trust Agreement (including the
                                     Additional Warrants Terms on Schedule III)
                                     or the Warrants, such exercise will be
                                     rescinded pursuant to Section 1.1(h) or
                                     Section 1.1(i) of Schedule III.

                                     Redemptions Priority:

                                     On any Distribution Date occurring in
                                     connection with a redemption of the
                                     Underlying Securities, to the extent such
                                     Distribution Date occurs due to a
                                     redemption of the Underlying Securities and
                                     only to the extent such Distribution Date
                                     does not relate to an exercise of Warrants,
                                     whether or not such redemption results in a
                                     Trust Wind-Up Event, the Trustee shall
                                     apply amounts available in connection with
                                     such redemption (excluding the amounts
                                     allocable to the aggregate Corresponding
                                     Underlying Security Amount related to any
                                     exercise of Warrants provided for above):

                                     FIRST, to the payment of any accrued and
                                     unpaid interest on the Class A Units and
                                     any accrued and unpaid Class B Payments
                                     being redeemed pro rata in proportion to
                                     the outstanding amount of accrued and
                                     unpaid interest and unpaid payments on
                                     each,

                                     SECOND, to the payment of the outstanding
                                     principal on the Class A Units being
                                     redeemed,

                                     THIRD, any remaining amounts, if any, to
                                     the payment of the Class B Present Value
                                     Amount with respect to Class B Units
                                     redeemed, adjusted for any accrued Class B
                                     Payments paid under Clause FIRST, as an
                                     Additional Distribution on the Class B
                                     Units redeemed,

                                     FOURTH, any remaining amounts, if any, to
                                     the payment of any accrued and unpaid
                                     Expense Administrator's Fee, and

                                     FIFTH, any remaining amounts, if any, to
                                     the Warrantholders, as payment of any
                                     Warrant Termination Payment.

                                     Any amortization or other payment by the
                                     Underlying Security Issuer on the
                                     Underlying Securities shall be treated as a
                                     redemption if not otherwise addressed
                                     herein.

                                     Other Trust Wind-Up Events Priority:

                                     On any Distribution Date occurring in
                                     connection with a Trust Wind-Up Event due
                                     to an event or events other than an
                                     exercise of Warrants or a redemption of
                                     Underlying Securities (or to the extent
                                     thereof), the Trustee shall apply amounts
                                     available (excluding the amounts allocable
                                     to the aggregate Corresponding Underlying
                                     Security Amount related to any exercise of
                                     Warrants provided for above or the amounts
                                     distributable in connection with a
                                     redemption as provided for above):

                                     FIRST, to the payment of the claims of the
                                     Class A Units and the Class B Units pro
                                     rata in proportion to the relative claim
                                     amounts of each, and for this purpose the
                                     Class A Units will have a claim equal to
                                     their Unit Principal Balance plus accrued
                                     and unpaid interest, if any and the Class B
                                     Units will have a claim equal to the Class
                                     B Present Value Amount determined as of the
                                     date of termination, in full satisfaction
                                     of the claims of the Class A Units and the
                                     Class B Units,

                                     SECOND, to the payment of any accrued and
                                     unpaid Expense Administrator's Fee, and

                                     THIRD, any remaining amounts are paid to
                                     the Warrantholders, as payment of any
                                     Warrant Termination Payment.

Record Date:                         The Record Date for each Distribution Date
                                     shall be the third Business Day prior to
                                     such Distribution Date, without adjustment
                                     for any change in the Distribution Date due
                                     to the receipt of funds for distribution
                                     after 12 noon, except that in respect of
                                     the final Distribution Date, when
                                     distributions will be made against
                                     presentation of the Units.

Form:                                Global security; except Units re-issued in
                                     connection with an exercise of Warrants.

Depositary:                          DTC

Trustee Fees and Expenses:           As compensation for and in payment of trust
                                     expenses related to its services hereunder
                                     other than Extraordinary Trust Expenses,
                                     the Trustee will receive Trustee Fees on
                                     each Distribution Date in the amount equal
                                     to $2,000. The Trustee Fee shall cease to
                                     accrue after termination of the Trust. The
                                     "Trigger Amount" with respect to
                                     Extraordinary Trust Expenses for the Trust
                                     is $25,000 and the Maximum Reimbursable
                                     Amount is $100,000. The Trustee Fee will be
                                     paid by the Expense Administrator. Expenses
                                     will be reimbursed by the Expense
                                     Administrator in accordance with the
                                     Expense Administration Agreement.

Expense Administrator:               The Trustee will act as Expense
                                     Administrator on behalf of the Trust
                                     pursuant to an Expense Administration
                                     Agreement, dated as of the date of the
                                     Trust Agreement (the "Expense
                                     Administration Agreement"), between the
                                     Trustee as Expense Administrator (the
                                     "Expense Administrator") and the Trust.

                                     The Expense Administrator will receive a
                                     fee equal to $5,500 payable on each
                                     Distribution Date. The Expense
                                     Administrator Make-Whole Amount, if any,
                                     shall also be considered part of the
                                     Expense Administrator's fee hereunder and
                                     under the Expense Administration Agreement.
                                     The Amounts specified in this paragraph are
                                     also referred to as the "Expense
                                     Administrator's Fee".

                                     The Expense Administrator will be
                                     responsible for paying the Trustee Fee and
                                     reimbursing certain other expenses of the
                                     Trust in accordance with the Expense
                                     Administration Agreement.

Expense Administrator
Make-Whole Amount:                   Except to the extent such exercise is in
                                     connection with a redemption, if any
                                     exercise of Warrants, together with any
                                     other Warrants exercised on the same Call
                                     Date, is an exercise of less than all
                                     Warrants remaining unexercised, the
                                     applicable Call Price shall include an
                                     amount equal to the present value of a
                                     stream of payments equal to $5,500 payable
                                     on each scheduled Distribution Date
                                     discounted at a rate of 5.0% per annum on
                                     the basis of a 360 day year consisting of
                                     twelve 30 day months from but excluding the
                                     date of such exercise until and including
                                     the Scheduled Final Distribution Date,
                                     assuming for this purpose that the Trust is
                                     not terminated prior to the Scheduled Final
                                     Distribution Date, multiplied by the Unit
                                     Principal Balance of applicable Class A
                                     Units to be called and divided by the
                                     Initial Unit Principal Balance of the Class
                                     A Units.

Listing:                             The Depositor has applied to list the Class
                                     A Units on the New York Stock Exchange.

ERISA Restrictions:                  With respect to the Class A Units, no ERISA
                                     restrictions apply. With respect to the
                                     Class B Units, the No Plan Restriction
                                     applies.

QIB Restriction:                     Applicable to the Class B Units only.

Termination:                         If a Trust Wind-Up Event occurs, any
                                     Underlying Securities held by the Trust
                                     will be liquidated (by delivery to the
                                     Underlying Security Issuer in the event of
                                     a redemption, pursuant to the Warrant Terms
                                     in the event of an exercise of the Warrants
                                     or otherwise by sale thereof).

Warrant Termination Payment:         Any amounts available for payment pursuant
                                     to the Distribution Priorities above as a
                                     Warrant Termination Payment.

Tender Offers:                       The Trust will not participate in any
                                     tender offer for the Underlying Securities
                                     and the Trustee will not accept any
                                     instructions to the contrary from the
                                     Unitholders, except in connection with an
                                     exercise by a Warrantholder of Warrants.
                                     Any Warrantholder may exercise Warrants in
                                     connection with any tender offer for the
                                     Underlying Securities and the Trustee may
                                     participate in the tender offer on behalf
                                     of an exercising Warrantholder.

Depositor Optional Exchange:         Depositor Optional Exchange applies to this
                                     Series of Units.

                                     Section 5.12(c)(ii) of the Standard Terms
                                     shall be incorporated herein by replacing
                                     5.12 (c)(ii) with the following: "(ii) such
                                     exchange is to be effected on any
                                     Distribution Date or any date that is 90
                                     days before or after a Distribution Date
                                     (or the succeeding Business Day if such
                                     date is not a Business Day) with 45 days'
                                     notice".

                                     Pursuant to 5.12(c)(iii), a corresponding
                                     portion of the Warrants must consent to
                                     such an exchange. The Depositor may satisfy
                                     the consent requirement of the preceding
                                     sentence by tendering a corresponding
                                     portion of Warrants or by delivering
                                     consents from a corresponding portion of
                                     Warrants (including Warrants it owns) or
                                     any combination thereof. Pursuant to
                                     5.12(c)(iii), the Expense Administrator
                                     must consent to such an exchange.

                                     Section 5.12(c)(iv) of the Standard Terms
                                     shall be incorporated herein by adding the
                                     following to Section 5.12(c): "(iv) the
                                     Depositor determines that more than 100
                                     holders of the Class A Units and 100
                                     holders of the Class B Units independent of
                                     the Trust and each other will remain after
                                     such exchange; unless the Depositor
                                     determines that such an exchange is
                                     otherwise consistent with the restrictions
                                     under ERISA and Section 4975 of the
                                     Internal Revenue Code of 1986."

Optional Exchange
Under Warrants:                      A Call Notice under Schedule III shall also
                                     constitute a notice of and a demand to
                                     exchange each of the Units acquired
                                     pursuant to the related exercise for a
                                     corresponding portion of Trust Property
                                     pursuant to Section 5.12(d) of the Standard
                                     Terms. Such notice and demand may only be
                                     revoked or rescinded to the extent that the
                                     related exercise is revoked or rescinded
                                     and the settlement of the Optional Exchange
                                     shall be the Exercise Date.

                                     Trust Property distributable to a
                                     Warrantholder who has acquired Units by
                                     exercise in connection with a tender offer
                                     or redemption as addressed in Section
                                     1.1(i) of Schedule III, shall be the Trust
                                     Property specified in Section 1.1(i) of
                                     Schedule III payable in the manner
                                     specified in the Distribution Priority.

Terms of Retained Interest:          Notwithstanding any other provision herein
                                     or in the Standard Terms, the Depositor
                                     retains the right to receive any and all
                                     interest that accrues on the Underlying
                                     Securities prior to the Closing Date. The
                                     Depositor will receive such accrued
                                     interest on the first Distribution Date (or
                                     redemption date or Call Date if earlier)
                                     for the Units and such amount shall be paid
                                     from the interest payment made with respect
                                     to the Underlying Securities on the first
                                     Distribution Date.

                                     The amount of the Retained Interest is
                                     $72,611.

                                     If an Underlying Security Default occurs on
                                     or prior to the first Distribution Date and
                                     the Depositor does not receive such
                                     Retained Interest amount in connection with
                                     such Distribution Date, the Depositor will
                                     have a claim for such Retained Interest,
                                     and will share pro rata with holders of the
                                     Units to the extent of such claim in the
                                     proceeds from the recovery on the
                                     Underlying Securities.

Sale of Underlying Securities:       In connection with any sale of the
                                     Underlying Securities by the Selling Agent
                                     pursuant to the terms hereof, if a
                                     Warrantholder is not an affiliate of the
                                     Selling Agent, the Selling Agent will
                                     extend a right of first refusal to each
                                     such Warrantholder to purchase the
                                     Underlying Securities at the highest bid
                                     received by the Selling Agent.

                                     If more than one Warrantholder exercises
                                     such right of first refusal, Underlying
                                     Securities will be sold to each exercising
                                     Warrantholder in proportion to the number
                                     of Warrants held by such Warrantholder;
                                     provided, that if only one Warrantholder
                                     exercises such right of first refusal, such
                                     Warrantholder shall be entitled to purchase
                                     any or all of the Underlying Securities to
                                     be sold by the Selling Agent.

Selling Agent:                       Morgan Stanley & Co. Incorporated.

Rating Agency Condition:             The definition of Rating Agencies Condition
                                     in the Standard Terms shall not apply and
                                     the following shall apply instead:

                                     "Rating Agency Condition": With respect to
                                     any specified action or determination,
                                     means receipt of (i) written confirmation
                                     by Moody's (if the Units are rated by
                                     Moody's, for so long as the Units are
                                     outstanding and rated by Moody's) and (ii)
                                     written confirmation by S&P (if the Units
                                     are rated by S&P, for so long as the Units
                                     are outstanding and rated by S&P), that
                                     such specified action or determination will
                                     not result in the reduction or withdrawal
                                     of their then-current ratings on the Units.
                                     Such confirmation may relate either to a
                                     specified transaction or may be a
                                     confirmation with respect to any future
                                     transactions which comply with generally
                                     applicable conditions published by the
                                     applicable rating agency.

Voting:                              With respect to any voting or other rights
                                     of any Unitholder or Class of Units based
                                     on the Unit Principal Balance or
                                     denomination of the applicable Units, each
                                     Class B Unitholder shall be treated as
                                     holding Units with a Unit Principal Balance
                                     or denomination equal to the Class B
                                     Present Value Amount of the Class B Units
                                     held by such Class B Unitholder as of the
                                     applicable Record Date or date of
                                     determination.

Unit Principal Balance:              Except with respect to the "Voting"
                                     provision above, when the Unit Principal
                                     Balance is used with respect to the Class B
                                     Units, it shall be deemed to mean "Initial
                                     Notional Amortizing Balance".

Amendments:                          Notwithstanding anything to the contrary in
                                     the Standard Terms, amendments to the
                                     Warrants and to Schedule III hereof shall
                                     be governed by Section 7.02 of the Standard
                                     Terms. For the avoidance of doubt, the
                                     terms of the Warrant and Schedule III may
                                     not be amended without consent of all
                                     Warrantholders.

Additional Terms:                    Section 12.10 of the Standard Terms shall
                                     apply as modified below to include the
                                     Warrantholders:

                                     "Prior to the date that is one year and one
                                     day after all distributions in respect of
                                     the Units have been made, none of the
                                     Trustee, the Trust, the Depositor or the
                                     Warrantholders shall take any action,
                                     institute any proceeding, join in any
                                     action or proceeding or otherwise cause any
                                     action or proceeding against any of the
                                     others under the United States Bankruptcy
                                     Code or any other liquidations, insolvency,
                                     bankruptcy, moratorium, reorganization or
                                     similar law ("Insolvency Law") applicable
                                     to any of them, now or hereafter in effect,
                                     or which would be reasonably likely to
                                     cause any of the others to be subject to,
                                     or seek the protection of, any such
                                     Insolvency Law."

Compliance Certificate:              The Trustee will provide to the Depositor
                                     an appropriate compliance certificate in
                                     connection with the annual report of the
                                     Depositor and/or the Trust and, upon the
                                     reasonable request of the Depositor, at
                                     other times, with respect to the Trustee's
                                     compliance with its duties and obligations
                                     under this Trust Agreement. A form of such
                                     certification is attached as Annex A.

Distribution Reports:                The Trustee shall file each distribution
                                     report on Form 8-K within 15 days of the
                                     related Distribution Date. Each such
                                     distribution report or Form 8-K shall
                                     contain text substantially similar to the
                                     following:

                                     The underlying security issuer or
                                     guarantor, as applicable, is subject to the
                                     informational requirements of the Exchange
                                     Act. The underlying security issuer or
                                     guarantor, as applicable, currently files
                                     reports, proxy statements and other
                                     information with the SEC. Those reports and
                                     other information can be inspected and
                                     copied at the public reference facilities
                                     maintained by the SEC at Room 1024, 450
                                     Fifth Street, N.W., Washington, D.C. 20549.
                                     Copies of those materials can be obtained
                                     by making a written request to the SEC,
                                     Public Reference Section, 450 Fifth Street,
                                     N.W., Washington, D.C. 20549, at prescribed
                                     rates. The SEC also maintains a website on
                                     the internet at http://www.sec.gov at which
                                     users can view and download copies of
                                     reports, proxy, information statements and
                                     other information filed electronically. In
                                     addition, those reports and other
                                     information may also be obtained from the
                                     underlying security issuer by making a
                                     request to the underlying security issuer.

<PAGE>
                                                           ANNEX A TO SCHEDULE I

                        LASALLE BANK NATIONAL ASSOCIATION

                     ABS ANNUAL REPORT BACKUP CERTIFICATION


         In connection with the preparation and delivery of the annual report on
Form 10-K of MS Structured Asset Corp. for the fiscal year ending [   ], and the
certifications given by [   ], [   ] and [   ] with respect thereto, the
undersigned hereby certifies that he is a duly elected [   ] of LaSalle Bank
National Association and further certifies in his capacity as such as follows:

1. LaSalle Bank National Association has prepared all distribution reports with
respect to each distribution date for each trust under the SATURNS program,
which includes each trust listed in Item 5 of the annual report, and has filed a
copy of such reports on Form 8-K during the fiscal year as described on Exhibit
A hereto.

2. I have reviewed all reports on Form 8-K containing distribution reports filed
in respect of periods included in the fiscal year covered by the annual report
of MS Structured Asset Corp.;

3. I am familiar with the operations of LaSalle Bank National Association with
respect to the SATURNS program and each of the applicable trusts and the
requirement imposed by each of the applicable trust agreements;

4. Based on my knowledge, the information in the distribution reports, taken as
a whole, does not contain any untrue statement of a material fact or omit to
state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading as of the
last day of the period covered by the annual report;

5. Based on my knowledge, the information required to be provided under each
trust agreement, for inclusion in these reports, is included in these reports;

6. Based on my knowledge, and except as disclosed in the reports, the trustee
has fulfilled its obligations, including any servicing obligations, under the
trust agreement.

7. Based on my knowledge, and except as disclosed in the reports, there are no
material legal proceedings with respect to any trust, involving the trust or
LaSalle Bank National Association as trustee.



                                           By:
                                              ---------------------------------
                                           Name:
                                           Title:
                                           Date:

<PAGE>

<TABLE>
                                                                            EXHIBIT A TO ANNEX A TO SCHEDULE I



                                     MORGAN STANLEY STRUCTURED ASSET CORP.

                       [FORM OF SCHEDULE OF DISTRIBUTION DATE REPORTS FILED ON FORM 8-K]

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 SATURNS       Closing           Collateral              Payment Dates           Form 8-K Filing Dates (Not
Trust No.:      Date                                                             Trust Agreement Filings in
                                                                                connection with Closing Date)


                                                                                          For FY [ ]
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<S>            <C>               <C>                     <C>                     <C>
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</TABLE>

<PAGE>

                                   Schedule II
                            (Terms of Trust Property)

Underlying Securities:               AT&T Corp. adjustable rate debentures due
                                     November 15, 2031

Underlying Security Issuer:          AT&T Corp.

Principal Amount:                    $30,000,000

Underlying Security Rate:            The Underlying Securities were issued with
                                     an initial interest rate of 8.00% and
                                     currently have an interest rate of 8.75%.
                                     The interest rate payable on the Underlying
                                     Securities will be increased by 0.25% for
                                     each rating notch downgrade by either
                                     Moody's or S&P and decreased by 0.25% for
                                     each rating notch upgrade by either Moody's
                                     or S&P, but in no event will the interest
                                     rate be reduced below the initial interest
                                     rate of 8.00%. Any such interest rate
                                     increase or decrease will take effect from
                                     the interest payment period beginning
                                     immediately after the first interest
                                     payment date following the related rating
                                     downgrade or upgrade, as the case may be.
                                     There is no limit to the number of times
                                     the interest rate payable on the Underlying
                                     Securities can be adjusted.

Credit Ratings:                      Baa2 by Moody's (negative outlook)

                                     BBB by S&P

Listing:                             Luxembourg Stock Exchange

Underlying Security
Issuance Agreement:                  An indenture dated as of November 21, 2002
                                     between the Underlying Security Issuer and
                                     the Underlying Security Trustee as
                                     supplemented and amended from time to time.

Form:                                Global

Currency of
Denomination:                        United States dollars

Acquisition Price by Trust:          $33,932,000

Underlying Security
Payment Date:                        Each May 15 and November 15

Original Issue Date:                 The Underlying Securities were originally
                                     issued pursuant to Rule 144A under the
                                     Securities Act of 1933 under an indenture
                                     dated November 21, 2002 and publicly
                                     offered in an exchange offer on or about
                                     July 31, 2002 in a principal amount of
                                     $2,750,000,000.

Maturity Date:                       November 15, 2031

Sinking Fund Terms:                  Not Applicable

Redemption Terms:                    As described in the Underlying Securities
                                     Issuance Agreement, the Underlying
                                     Securities are redeemable, as a whole or in
                                     part, at any time or from time to time, at
                                     the option of the Underlying Security
                                     Issuer. Upon a "tax event", the Underlying
                                     Security Issuer may redeem the Underlying
                                     Securities for a redemption price equal to
                                     the principal amount plus accrued interest,
                                     if any.

CUSIP No.:/ISIN No.                  001957BD0

Underlying Security Trustee:         The Bank of New York

<PAGE>

                                  Schedule III
                            ADDITIONAL WARRANT TERMS

                                    ARTICLE I
                              EXERCISE OF WARRANTS


         Section 1.1       Principal Terms.

         (a) Call Price.

         The Call Price per Warrant is the sum of (i)(a) $1,000 (corresponding
to 40 $25.00 Class A Units) or (b) if such exercise is in connection with a
tender offer for Underlying Securities held by the Trust for settlement prior to
the First Regular Call Date, $1,060 ($26.50 per Class A Unit), (ii) the
applicable Class B Present Value Amount (which will be adjusted for any accrued
Class B Payments on the Class B Units payable under (iii)), (iii) accrued and
unpaid interest on the applicable Class A Units and accrued and unpaid Class B
Payments on the applicable Class B Units being called and (iv) the applicable
Expense Administrator Make-Whole Amount.

         (b) Call Dates.

         A Warrantholder may designate as a Call Date (i) any Business Day from
and including 9:00 a.m. New York time on the First Regular Call Date, to and
including 4:00 p.m. New York time on the Expiration Date and (ii) any Business
Day prior to the First Regular Call Date as a Call Date, but only if notice of
redemption or tender offer has been delivered by the Underlying Security Issuer
with regard to the Underlying Securities held by the Trust.

         Except as otherwise provided in this paragraph, a Warrantholder shall
give notice of its intention to exercise Warrants and related designation of a
Call Date on not less than 15 or more than 60-calendar days' notice. If the
Underlying Security Issuer has given notice of redemption with respect to the
Underlying Securities or if a tender offer is outstanding for the Underlying
Securities, a Warrantholder may give notice of its intention to exercise
Warrants and related designation of a Call Date with two Business Days notice
prior to the Call Date but no later than 4:00 p.m. New York City time on the
second Business Day immediately preceding the then-scheduled settlement of the
tender offer or redemption.

         (c) Expiration Date. The Scheduled Final Distribution Date.

         (d) First Regular Call Date. November 25, 2008.

         (e) Corresponding Underlying Security Amount. The product of (x) the
applicable number of Warrants, (y) $1,000 and (z) the Security Factor.

         (f) Security Factor. The aggregate principal amount of Underlying
Securities initially held by the Trust divided by the Initial Unit Principal
Balance of the Class A Units.

         (g) Call Notice.

         Each exercising Warrantholder shall deliver a notice in the form of
Exhibit B to the Trustee and the Warrant Agent, including the certification of
solvency specified therein, prior to the Call Date. Each such Call Notice must
specify exercise of either (i) all Warrants the notifying Warrantholder owns or
(ii) Warrants sufficient to call at least 250 Warrants.

         A Call Notice also constitutes a notice of exchange of the Class A
Units and the Class B Units to be obtained by a Warrantholder as a result of
such exercise for Trust Property pursuant to Section 5.12(d) of the Standard
Terms.

         (h) Automatic Rescission of Exercise.

         Delivery of a Call Notice does not give rise to an obligation on the
part of the Warrantholder to pay the Call Price. With respect to each Warrant
exercised, if by 4 p.m. New York time on the Business Day prior to the Call Date
the applicable Warrantholder has not paid the applicable Call Price for a
Warrant to the Warrant Agent, except to the extent the Call Notice relates to a
tender offer or redemption of Underlying Securities addressed in Section 1.1(i)
below, then the exercise of the applicable Warrant shall be automatically
rescinded, the applicable Warrant shall be reinstated, no Call Date with respect
thereto shall be deemed to have occurred and no Call Notice deemed given, and
the applicable Warrantholder shall be entitled to exercise such reinstated
Warrants in the future.

         (i) Tender Offer and Redemption.

         Each Warrantholder shall specify in its Call Notice if its exercise is
in connection with a redemption or tender offer if the specified Call Date will
occur on or after the First Regular Call Date. Any Warrantholder giving a Call
Notice with respect to a Call Date prior to the First Regular Call Date shall be
deemed to specify that it is exercising its Warrants in connection with a tender
offer or redemption.

         A Warrantholder specifying or deemed to specify that it is exercising
its Warrants in connection with a tender offer for or a redemption of the
Underlying Securities shall be deemed to instruct the Trustee to tender the
applicable Corresponding Underlying Security Amount in connection with such
redemption or tender offer.

         To the extent Underlying Securities corresponding to such a deemed
instruction to tender are not accepted by the tender offeror or Underlying
Security Issuer and paid for in accordance with the terms of the tender offer or
redemption, a corresponding number of Warrants shall be reinstated, with
exercise thereof rescinded, no Call Date with respect thereto shall be deemed to
have occurred and no Call Notice deemed given, with the number of such
reinstated Warrants to be allocated among the Warrantholders specifying or
deemed to specify exercise in connection with such tender offer or redemption in
proportion to the number of Warrants initially so exercised by each, and each
such Warrantholder shall be entitled to exercise such reinstated Warrants in the
future. The Warrant Agent shall determine such allocation by notice to the
applicable Warrantholders.

         A Warrantholder specifying or deemed to specify that it is exercising
its Warrants in connection with a tender offer for or a redemption of the
Underlying Securities, to the extent such exercise is not rescinded, shall be
entitled to Trust Property in an amount equal to the proceeds of the tender
offer or redemption allocable to the applicable Corresponding Underlying
Security Amount in excess of the aggregate Call Price for the applicable number
of Warrants.

         If the Warrant Agent receives a Call Notice or Call Notices with
respect to Warrants with an aggregate Corresponding Underlying Security Amount
that is less than the aggregate principal amount of Underlying Securities held
by the Trust subject to redemption, the Warrant Agent shall determine by notice
to the applicable Warrantholders which Warrants are to be terminated in
connection with such redemption by allocating the termination of Warrants pro
rata among remaining Warrantholders (including exercising Warrantholders holding
unexercised Warrants) in proportion to their holdings of unexercised Warrants.
Warrants so terminated shall be entitled to the applicable Warrant Termination
Payment.

         If the Warrant Agent receives no Call Notices with respect to a
redemption of Underlying Securities, a number of Warrants equal to the aggregate
principal amount of Underlying Securities held by the Trust that are redeemed
divided by the product of (x) the Security Factor and (y) $1,000, shall be
terminated. The Warrant Agent shall determine by notice to the applicable
Warrantholders which Warrants are to be terminated by allocating such
termination among Warrantholders in proportion to the number of Warrants held by
each. Warrants so terminated shall be entitled to the applicable Warrant
Termination Payment.

         Whenever the Warrant Agent is obligated to allocate the termination of
Warrants pro rata, and this allocation would result in some Warrants being
partially terminated, the Warrant Agent shall randomly re-allocate terminations
to the extent necessary to ensure that only whole Warrants are terminated or
such that only one Warrant is partially terminated.

         (j) Payment of Call Price.

         Except with respect to Warrants exercised or deemed exercised in
connection with a redemption of or tender offer for the Underlying Securities,
each exercising Warrantholder shall deposit the applicable Call Price for all
Warrants exercised by it with the Warrant Agent no later than the Business Day
prior to settlement of exercise.

         The Warrant Agent shall notify the Trustee immediately upon its receipt
of payment of the applicable Call Price. The Warrant Agent shall transfer the
amount of any paid Call Price to the Trustee in immediately available funds, for
deposit in the Unit Account and application pursuant to the other terms of this
Trust Agreement no later than 4 p.m. New York time on the Business Day preceding
the Call Date and, pending such transfer, shall hold such amount for the benefit
of the Warrantholder in a segregated trust account.

         (k) Appointment of Warrant Agent.

         The Depositor hereby appoints the Warrant Agent as agent to (i) receive
for the benefit of the Warrantholders pending payment to the Trust in connection
with exercise of the Warrants from time to time, the Call Price amounts paid to
the Warrant Agent, (ii) receive for the benefit of the Warrantholders, in
connection with exercise of the Warrants from time to time, the Units deemed
tendered to the Trust pursuant to Section 1.2, and the Trust Property received
pursuant to the related Optional Exchange pending delivery thereof to the
relevant Warrantholders and (iii) otherwise act on behalf of and for the benefit
of the Trust, the Unitholders and the Warrantholders for purposes of this
Agreement, and the Warrant Agent accepts such appointment for itself and its
successors and assigns, subject to the terms and provisions hereof.

         Section 1.2 Delivery of Units. As soon as practicable after each
surrender of Warrants in whole or in part on the Call Date and upon satisfaction
of all other requirements described in the Warrants and in Section 1.1 hereof,
the Warrant Agent shall instruct the Trustee to confirm that the transfer
specified under the "Callable Series" provisions of Schedule I has occurred and
to cause a distribution of Trust Property to the Warrantholder as an Optional
Exchange taking into account Section 1.1(i) above, if applicable. A surrender of
the Warrants shall be deemed to be a simultaneous surrender of the Class A Units
and Class B Units acquired in exchange therefor.

         If such exercise is in part only, the Warrant Agent shall instruct the
Trustee to authenticate new Warrants of like tenor, representing the outstanding
Warrants of the Warrantholder and the Warrant Agent shall deliver such Warrants
to the Warrantholder.

         In each case, the Trustee shall act in accordance with such
instructions.

         Section 1.3 Cancellation and Destruction of Warrants. All Warrants
surrendered to the Warrant Agent for the purpose of exercise (in whole or in
part) pursuant to Section 1.1 and actually exercised, or for the purpose of
transfer or exchange pursuant to Article III, shall be cancelled by the Warrant
Agent, and no Warrant (other than that reflecting any such transfer or exchange)
shall be issued in lieu thereof. The Warrant Agent shall destroy all cancelled
Warrants.

         Section 1.4 No Rights as Holder of Units Conferred by Warrants. Each
Warrantholder agrees that the Warrants do not represent an ownership interest in
the Trust or its assets and that none of them shall treat the Warrants as an
ownership interest in the Trust for any purpose.

                                   ARTICLE II
                            RESTRICTIONS ON TRANSFER

         Section 2.1 Restrictive Legends. Each Warrant (including each Warrant
issued upon the transfer of any Warrant) shall be issued with a legend in
substantially the form contained in Exhibit A hereto.

         Section 2.2 Notice of Proposed Transfer. Prior to any transfer of any
Warrant or portion thereof, the Warrantholder will give 5 Business Days (or such
lesser period acceptable to the Warrant Agent) prior written notice to the
Warrant Agent and the Depositor of such Warrantholder's intention to effect such
transfer.

                                   ARTICLE III
                   REGISTRATION AND TRANSFER OF WARRANTS, ETC.

         Section 3.1 Warrant Register; Ownership of Warrants. The Warrant Agent
will keep a register in which the Warrant Agent will provide for the
registration of Warrants and the registration of transfers of Warrants
representing numbers of Warrants. The Trustee and the Warrant Agent may treat
the Person in whose name any Warrant is registered on such register as the owner
thereof for all purposes, and the Trustee and the Warrant Agent shall not be
affected by any notice to the contrary. The Warrant Agent shall make such
adjustments to its records and the register as shall be necessary to reflect
terminations and exercise of Warrants.

         Section 3.2 Transfer and Exchange of Warrants. (a) No Warrant may be
offered, resold, assigned or otherwise transferred (including by pledge or
hypothecation) at any time except in accordance with this Section 3.2.

         (1) Any purchaser or transferee of the Warrants shall represent that it
is (A) a "qualified institutional buyer" as defined in Rule 144A under the
Securities Act that (1) is not a broker-dealer that owns and invests on a
discretionary basis less than $25 million in securities of issuers that are not
affiliated persons of the dealer and (2) is not a plan referred to in paragraph
(a)(1)(i)(D) or (a)(1)(i)(E) of Rule 144A or a trust fund referred to in
paragraph (a)(1)(i)(F) of Rule 144A that holds the assets of such a plan, if
investment decisions with respect to the plan are made by the beneficiaries of
the plan, (B) aware that the sale or transfer of the Warrants to it may be made
to it in reliance on the exemption from registration provided by Rule 144A under
the Securities Act and (C) acquiring the Warrants for its own account or for one
or more accounts, each of which is a qualified institutional buyer, and as to
each of which the purchaser or transferee exercises sole investment discretion,
and in each case in accordance with any applicable securities laws of any state
of the United States and other jurisdictions.

         (2) Warrants may not be purchased, held by or transferred to any Person
unless that Person is not a Plan, is not a governmental or other plan subject to
restrictions substantially similar to Title I of ERISA or Section 4975 of the
Code, and is not acquiring the Warrants with the assets of any such Plan or
other plan. Each Person who acquires any Warrant, and each fiduciary which
causes any such Person to acquire any Warrant, in its individual as well as its
fiduciary capacity, will be deemed by such purchase, holding or acquisition, on
each date on which the Warrant is held by such person, to have represented that
it is not a Plan or any governmental or other plan subject to requirements
substantially similar to Title I of ERISA or Section 4975 of the Code and is not
using the assets of any such Plan to purchase those Warrants. Each Person that
acquires a Warrant, and each fiduciary who causes a person to acquire a Warrant,
in its individual as well as its fiduciary capacity, agrees to indemnify and
hold harmless the Depositor, the Trustee, the Warrant Agent, MS&Co., each
Distribution Participant and their respective affiliates from any cost, damages,
loss or expense, incurred by them as a result of the representations contained
in this Section 3.2(a)(2) not being true.

         (b) Upon surrender of any Warrant for registration of transfer or for
exchange to the Warrant Agent, the Warrant Agent shall (subject to compliance
with Section 3.2(a)) promptly execute and deliver, and cause the Trustee, on
behalf of the Trust, to execute and deliver, in exchange therefor, a new Warrant
of like tenor and evidencing a like number of Warrants, in the name of such
Warrantholder or as such Warrantholder (upon payment by such Warrantholder of
any applicable transfer taxes or government charges) may direct; provided that
as a condition precedent for transferring the Warrants, the prospective
transferee shall deliver to the Trustee and the Depositor an executed copy of
the Transfer Letter in the form of Exhibit C hereto.

         (c) Any purported transfer of the Warrants (or any interest therein) in
violation of Section 3.2(a)(1) or Section 3.2(a)(2) hereof shall be void ab
initio and the purported transferee in such transfer shall not be recognized by
any Person as a holder of such Warrants for any purpose. The Depositor and the
Trustee shall each have the power to sell the Warrants (or any interest therein)
of a purported Warrantholder (or owner of any interest therein) who acquired its
interest in violation of Section 3.2(a)(1) or Section 3.2(a)(2) or who continues
to hold Warrants in violation of Section 3.2(a)(2).

         Section 3.3 Replacement of Warrants. Upon receipt of evidence
reasonably satisfactory to the Warrant Agent of the loss, theft, destruction or
mutilation of any Warrant and, in the case of any such loss, theft or
destruction of any Warrant, upon delivery of an indemnity bond in such
reasonable amount as the Warrant Agent may determine, or, in the case of any
such mutilation, upon the surrender of such Warrant for cancellation to the
Warrant Agent, the Warrant Agent shall execute and deliver, and cause the
Trustee, on behalf of the Trust, to execute and deliver, in lieu thereof, a new
Warrant of like tenor bearing a number not contemporaneously outstanding.

         Section 3.4 Execution and Delivery of Warrants by Trustee;
Authentication.

         The Trustee agrees and acknowledges that it will, concurrently with the
receipt by it of the Underlying Securities and the execution, authentication and
delivery of Units, cause to be executed, authenticated and delivered to or upon
the order of the Depositor, Warrants duly executed and authenticated by or on
behalf of the Trustee.

         The Trustee, on behalf of the Trust, hereby agrees (subject to
compliance with Article II) to execute and deliver such new Warrants issued in
accordance with Section 1.2 or this Article III as the Warrant Agent shall
request in accordance herewith.

         Upon surrender for registration of transfer of any Warrant at the
office or agency of the Trustee, if the requirements of Section 8-401 of the
Uniform Commercial Code are met to the Trustee's satisfaction, and subject to
the transfer restrictions set forth in this Schedule III, the Trustee shall
execute, authenticate and deliver, in the name of the designated transferee or
transferees, one or more new Warrants. All transfers of Warrants are subject to
the approval of the Trustee and the Trustee shall not register any transfer of
Warrants if such transfer would violate any provision of the Trust Agreement.

         Section 3.5 Federal Income Tax Matters. Each Warrantholder agrees to
treat each Warrant as a call option for federal income tax purposes.

                                   ARTICLE IV
                                  WARRANT AGENT

         Section 4.1 Limitation on Liability. The Warrant Agent shall be
protected and shall incur no liability for or in respect of any action taken,
suffered or omitted by it in connection with its administration of the Warrants
in reliance upon any instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement or other paper or document in good faith believed by it to be genuine
and to be signed, executed and, where necessary, verified and acknowledged, by
the proper Person or Persons. The Warrant Agent and any director, officer,
employee or agent of the Warrant Agent shall be indemnified by the Depositor to
the same extent that the Trustee is indemnified by the Depositor pursuant to
Section 10.05(b) of the Standard Terms.

         Section 4.2 Duties of Warrant Agent. The Warrant Agent undertakes only
the specific duties and obligations imposed hereunder upon the following terms
and conditions, by all of which the Depositor, the Trust, the Trustee and each
Warrantholder shall be bound:

         (a) The Warrant Agent may consult with legal counsel (who may be legal
counsel for the Depositor), and the opinion of such counsel shall be full and
complete authorization and protection to the Warrant Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion,
provided the Warrant Agent shall have exercised reasonable care in the selection
by it of such counsel.

         (b) Whenever in the performance of its duties hereunder, the Warrant
Agent shall deem it necessary or desirable that any fact or matter be proved or
established by the Depositor or the Trustee prior to taking or suffering any
action hereunder, such fact or matter may be deemed to be conclusively proved
and established by a Depositor Order or a certificate signed by a Responsible
Officer of the Trustee and delivered to the Warrant Agent; and such certificate
shall be full authorization to the Warrant Agent for any action taken or
suffered in good faith by it hereunder in reliance upon such certificate.

         (c) The Warrant Agent shall be liable hereunder only for its own
negligence, willful misconduct or bad faith.

         (d) The Warrant Agent shall not be liable for or by reason of any of
the statements of fact or recitals contained herein or be required to verify the
same, but all such statements and recitals are and shall be deemed to have been
made by the Trust and the Depositor only.

         (e) The Warrant Agent shall not have any responsibility in respect of
and makes no representation as to the validity of the Warrants or the execution
and delivery thereof (except the due execution hereof by the Warrant Agent); nor
shall it be responsible for any breach by the Trust of any covenant or condition
contained in the Warrants; nor shall it by any act thereunder be deemed to make
any representation or warranty as to the Units to be purchased thereunder.

         (f) The Warrant Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from the
Chairman of the Board, the Chief Executive Officer, Chief Financial Officer,
Chief Operating Officer, President, a Vice President, a Senior Vice President, a
Managing Director, its Treasurer, an Assistant Treasurer, its Secretary or an
Assistant Secretary of the Depositor, and any Responsible Officer of the
Trustee, and to apply to such officers for advice or instructions in connection
with its duties, and it shall not be liable for any action taken or suffered to
be taken by it in good faith in accordance with instructions of any such
officer.

         (g) The Warrant Agent and any shareholder, director, officer or
employee of the Warrant Agent may buy, sell or deal in any of the Warrants or
other securities of the Trust or otherwise act as fully and freely as though it
were not Warrant Agent hereunder, so long as such persons do so in full
compliance with all applicable laws. Nothing herein shall preclude the Warrant
Agent from acting in any other capacity for the Trust, the Depositor or for any
other legal entity.

         (h) The Warrant Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents.

         (i) The Warrant Agent shall act solely as the agent of the Trust, the
Unitholders and the Warrantholders hereunder as respectively set forth herein.
The Warrant Agent shall not be liable except for the failure to perform such
duties as are specifically set forth herein, and no implied covenants or
obligations shall be read into the Warrants against the Warrant Agent, whose
duties shall be determined solely by the express provisions thereof. The Warrant
Agent shall not be deemed to be a fiduciary.

         (j) The Warrant Agent shall not be responsible for any failure on the
part of the Trustee to comply with any of its covenants and obligations
contained herein.

         (k) The Warrant Agent shall not be required to expend or risk its own
funds or otherwise incur financial liability in the performance of its duties
hereunder and shall not be under any obligation or duty to institute, appear in
or defend any action, suit or legal proceeding in respect hereof, in each case
unless first indemnified to its satisfaction, but this provision shall not
affect the power of the Warrant Agent to take such action as the Warrant Agent
may consider proper, whether with or without such indemnity. The Warrant Agent
shall promptly notify the Depositor and the Trustee in writing of any claim made
or action, suit or proceeding instituted against it arising out of or in
connection with the Warrants.

         (l) The Trustee will perform, execute, acknowledge and deliver or cause
to be performed, executed, acknowledged and delivered all such further acts,
instruments and assurances as may be required by the Warrant Agent in order to
enable it to carry out or perform its duties hereunder.

         Section 4.3 Change of Warrant Agent. The Warrant Agent may resign and
be discharged from its duties hereunder upon thirty (30) days' notice in writing
mailed to the Depositor and the Trustee by registered or certified mail, and to
the Warrantholders by first-class mail at the expense of the Depositor; provided
that no such resignation or discharge shall become effective until a successor
Warrant Agent shall have been appointed hereunder. The Depositor may remove the
Warrant Agent or any successor Warrant Agent upon thirty (30) days' notice in
writing, mailed to the Warrant Agent or successor Warrant Agent, as the case may
be, and to the Warrantholders by first-class mail; provided further that no such
removal shall become effective until a successor Warrant Agent shall have been
appointed hereunder. If the Warrant Agent shall resign or be removed or shall
otherwise become incapable of acting, the Depositor shall promptly appoint a
successor to the Warrant Agent, which may be designated as an interim Warrant
Agent. If an interim Warrant Agent is designated, the Depositor shall then
appoint a permanent successor to the Warrant Agent, which may be the interim
Warrant Agent. If the Depositor shall fail to make such appointment of a
permanent successor within a period of thirty (30) days after such removal or
within sixty (60) days after notification in writing of such resignation or
incapacity by the resigning or incapacitated Warrant Agent or by the
Warrantholder, then the Warrant Agent or registered Warrantholder may apply to
any court of competent jurisdiction for the appointment of such a successor.

         Any successor to the Warrant Agent appointed hereunder must be rated in
one of the four highest rating categories by the Rating Agencies. Any entity
which may be merged or consolidated with or which shall otherwise succeed to
substantially all of the trust or agency business of the Warrant Agent shall be
deemed to be the successor Warrant Agent without any further action.

         Section 4.4 Warrant Agent Transfer Fee. The Warrant Agent will assess a
fee of $50.00 upon the issue of any new Warrant, such fee to be assessed upon
the new Warrantholder.

<PAGE>


                                                       EXHIBIT A TO SCHEDULE III

                           FORM OF WARRANT CERTIFICATE

              STRUCTURED ASSET TRUST UNIT REPACKAGINGS ("SATURNS")
                                 SERIES 2003-17
                                    WARRANTS


         EACH PURCHASER OR OTHER TRANSFEREE OF THIS WARRANT OR ANY INTEREST
HEREIN OF THIS WARRANT, BY ITS ACCEPTANCE HEREOF, IS DEEMED TO REPRESENT AND
WARRANT FOR THE BENEFIT OF THE TRUSTEE AND THE DEPOSITOR OF THE TRUST, AND EACH
DISTRIBUTION PARTICIPANT AS DEFINED IN THE TRUST AGREEMENT THAT SUCH PURCHASER
OR OTHER TRANSFEREE IS A "QUALIFIED INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A
UNDER THE SECURITIES ACT AND OF THE TYPE SET FORTH IN THE WARRANT TRANSFER
LETTER.

         THE HOLDER, AND EACH FIDUCIARY WHICH CAUSES ANY PERSON TO ACQUIRE ANY
WARRANT, IN ITS INDIVIDUAL AS WELL AS ITS FIDUCIARY CAPACITY, WILL BE DEEMED BY
SUCH PURCHASE, HOLDING OR ACQUISITION, ON EACH DATE ON WHICH THE WARRANT IS HELD
BY SUCH PERSON, TO HAVE REPRESENTED THAT IT IS NOT A (I) "EMPLOYEE BENEFIT PLAN"
(AS DEFINED IN SECTION 3(3) OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
1974, AS AMENDED ("ERISA")) SUBJECT TO THE FIDUCIARY RESPONSIBILITY PROVISIONS
OF TITLE I OF ERISA, (II) "PLAN" DESCRIBED IN SECTION 4975(E)(1) OF THE INTERNAL
REVENUE CODE OF 1986, AS AMENDED (THE "CODE") SUBJECT TO SECTION 4975 OF THE
CODE, (III) ENTITY WHOSE UNDERLYING ASSETS INCLUDE PLAN ASSETS BY REASON OF A
PLAN'S INVESTMENT IN SUCH ENTITY OR OTHERWISE OR (IV) GOVERNMENTAL OR OTHER PLAN
SUBJECT TO REQUIREMENTS SUBSTANTIALLY SIMILAR TO TITLE I OF ERISA OR SECTION
4975 OF THE INTERNAL REVENUE CODE.

         EACH PERSON THAT ACQUIRES A WARRANT, AND EACH FIDUCIARY WHO CAUSES A
PERSON TO ACQUIRE A WARRANT, IN ITS INDIVIDUAL AS WELL AS ITS FIDUCIARY
CAPACITY, AGREES TO INDEMNIFY AND HOLD HARMLESS THE DEPOSITOR, THE WARRANT
AGENT, THE TRUSTEE, MS&CO. AND THEIR RESPECTIVE AFFILIATES FROM ANY COST,
DAMAGES, LOSS OR EXPENSE, INCURRED BY THEM AS A RESULT OF THE REPRESENTATIONS
MADE BY SUCH PERSON OR FIDUCIARY IN THIS PARAGRAPH NOT BEING TRUE.

         THIS WARRANT MAY BE SUBJECT TO ADDITIONAL RESTRICTIONS ON TRANSFER AS
PROVIDED IN THE TRUST AGREEMENT FOR THE TRUST TO WHICH THIS WARRANT RELATES.

         Any purported transfer of this Warrant certificate (or any interest
herein) in violation of Section 3.2(a)(1) or Section 3.2(a)(2) of schedule iii
to the trust agreement shall be void ab initio and the purported transferee in
such transfer shall not be recognized by any Person as a holder of such Warrants
for any purpose. The Depositor and the Trustee shall each have the power to sell
the Warrants (or any interest herein) of a purported Warrantholder (or owner of
any interest herein) who acquired its interest in violation of Section 3.2(a)(1)
or Section 3.2(a)(2) of schedule iii to the trust agreement or who continues to
hold Warrants in violation of Section 3.2(a)(2) of schedule iii of the trust
agreement.

         THIS WARRANT SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES
HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.


Warrant No. 1                            CUSIP No. 80411H115

REGISTERED INITIAL NUMBER: 30,000

AGGREGATE INITIAL NUMBER
OF ALL WARRANTS:  30,000


              STRUCTURED ASSET TRUST UNIT REPACKAGINGS ("SATURNS")
                                 SERIES 2003-17
                                    WARRANTS

         This certifies that [     ] is the registered owner of Warrants in the
number specified above.

         The Trust Property will be held in trust by the Trustee identified in
the Trust Agreement (the "Trust"). The Trust has been created pursuant to a
Trust Agreement, dated as of November 25, 2003 (the "Trust Agreement"), between
LaSalle Bank National Association, as Trustee of the Trust (the "Trustee"), and
MS Structured Asset Corp.

         To the extent not defined herein, all capitalized terms shall have the
meanings assigned to such terms in the Trust Agreement and the Terms Schedule
attached thereto. This Warrant is one of the Warrants described in the Trust
Agreement and is issued under and subject to the terms, provisions and
conditions of the Trust Agreement. By acceptance of this Warrant, the
Warrantholder assents to and becomes bound by the Trust Agreement.

         Each Warrant issued by the Trust represents a Call Option and Call
Right to purchase $1,000 Unit Principal Balance of Class A Units and the
Applicable Class B Equivalent Amount. Exercises on this Certificate will be made
in accordance with a written notice to the Warrant Agent specified in the Trust
Agreement.

         This Certificate does not purport to summarize the Trust Agreement and
reference is hereby made to the Trust Agreement for information with respect to
the rights, benefits, obligations and duties evidenced thereby. A copy of the
Trust Agreement may be examined during normal business hours at the Corporate
Trust Office of the Trustee, located at 135 South LaSalle Street, Suite 1625,
Chicago, Illinois 60603 and at such other places, if any, designated by the
Trustee, by any Warrantholder upon request.

         Reference is hereby made to the further terms of this Certificate set
forth on the reverse hereof, which further terms shall for all purposes have the
same effect as if set forth at this place.

         Unless the certificate of authentication hereon shall have been
executed by an authorized officer of the Trustee, by manual signature, this
Certificate shall not entitle the Warrantholder hereof to any benefit under the
Trust Agreement or be valid for any purpose.

         IN WITNESS WHEREOF, the Trustee, on behalf of the Trust, and not in its
individual capacity, has caused this Certificate to be duly executed.

                                          SATURNS TRUST NO. 2003-17


                                          BY: LASALLE BANK NATIONAL
                                                   ASSOCIATION,
                                                   as Trustee


                                          By:
                                              -----------------------------
                                              Authorized Signatory

DATED:

[SEAL]


Trustee's Certificate of
Authentication:

                      This is one of the Warrants referred
                      to in the within-mentioned Agreement.


                                          LASALLE BANK NATIONAL ASSOCIATION,
                                                   as Authenticating Agent


                                          By:
                                              -----------------------------
                                              Authorized Signatory

<PAGE>

              STRUCTURED ASSET TRUST UNIT REPACKAGINGS ("SATURNS")

                                 SERIES 2003-17

         The Trust Agreement permits the amendment thereof, in certain
circumstances, without the consent of the Warrantholders of any of the
Certificates.

         As provided in the Trust Agreement and subject to certain limitations
therein set forth, the transfer of this Certificate is registerable in the
Warrant Register upon surrender of this Certificate for registration of transfer
at the office or agency maintained by the Trustee in Chicago, Illinois,
accompanied by a written instrument of transfer and, if applicable, a transfer
letter in form and substance satisfactory to the Trustee duly completed and
executed by the Warrantholder hereof or such Warrantholder's attorney duly
authorized in writing, and thereupon one or more new Certificates of authorized
denominations evidencing the same aggregate interest in the Trust will be issued
to the designated transferee.

         As provided in the Trust Agreement and subject to certain limitations
therein set forth, Certificates are exchangeable for new Certificates
representing different numbers of Warrants which evidence the same aggregate
Warrants, as requested by the Warrantholder surrendering the same. No service
charge will be made for any such registration of transfer or exchange, but the
Trustee may require payment of a sum sufficient to cover any tax or governmental
charges payable in connection therewith.

         The Depositor, the Trustee and any agent of the Depositor or the
Trustee may treat the person in whose name this Certificate is registered as the
owner hereof for all purposes, and none of the Depositor, the Trustee, or any
such agent shall be affected by any notice to the contrary.

         Notwithstanding anything contained in the Trust Agreement to the
contrary the Trust Agreement has been accepted by LaSalle Bank National
Association not in its individual capacity but solely as Trustee and in no event
shall LaSalle Bank National Association have any liability for the
representations, warranties, covenants, agreements or other obligations of the
Depositor thereunder or in any of the certificates, notices or agreements
delivered pursuant thereto, as to all of which recourse shall be had solely to
the assets of the Depositor, and under no circumstances shall LaSalle Bank
National Association be personally liable for the payment of any indebtedness or
expenses of the Trust. The Warrants do not represent interests in or obligations
of the Trustee and the Trustee shall not be responsible or accountable for any
tax, accounting or other treatment proposed to be applied to the Warrants or any
interest therein except as expressly provided in the Trust Agreement.

<PAGE>

                                   ASSIGNMENT

         FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers
unto

PLEASE INSERT SOCIAL SECURITY
OR OTHER IDENTIFYING NUMBER
OF ASSIGNEE


-------------------------------------------------------------------------------

(Please print or typewrite name and address, including postal zip code, of
assignee)

--------------------------------------------------------------------------------

the within Certificate, and all rights thereunder, hereby irrevocably
constituting and appointing

--------------------------------------------------------------------------------

Attorney to transfer said Certificate on the books of the Certificate Registrar,
with full power of substitution in the premises.

Dated:


         ---------------------------------*/








---------------

         */ NOTICE: The signature to this assignment must correspond with the
name as it appears upon the face of the within Certificate in every particular,
without alteration, enlargement or any change whatever. Such signature must be
guaranteed by a member of the New York Stock Exchange or a commercial bank or
trust company.

<PAGE>

                                                       EXHIBIT B TO SCHEDULE III

             FORM OF EXCERCISE NOTICE AND CERTIFICATION OF SOLVENCY

                                                               [DATE]

LaSalle Bank National Association
135 S. LaSalle Street
Chicago, Illinois 60603

MS Structured Asset Corp.
1585 Broadway
New York, New York 10036

Re: Structured Asset Trust Unit Repackagings ("SATURNS"), Series 2003-17

Ladies and Gentlemen:

         We hereby give notice of our intend to acquire __________ Unit
Principal Balance of Class A Units and the Applicable Class B Equivalent Amount
of Class B Units for settlement on _________ (the "Call Date"). [We hereby
direct the Trustee and the Warrant Agent to treat this exercise [up to]
__________ Unit Principal Balance of Class A Units and an Applicable Class B
Equivalent Amount of Class B Units as an exercise in connection with a
[redemption][tender offer] up to the maximum amount allocable to us in
connection with this exercise.]

         We certify that our assets exceed our liabilities, that we are able to
meet our obligations as they come due, and that we are not subject to any
bankruptcy or insolvency proceeding.

                                           [WARRANTHOLDER]



                                           By:
                                               ---------------------------------
                                               Name:
                                               Title:

<PAGE>

                                                       EXHIBIT C TO SCHEDULE III

                         FORM OF WARRANT TRANSFER LETTER

                                                               [DATE]

LaSalle Bank National Association
135 S. LaSalle Street
Chicago, Illinois 60603

MS Structured Asset Corp.
1585 Broadway
New York, New York 10036

Re: Structured Asset Trust Unit Repackagings ("SATURNS"), Series 2003-17

Ladies and Gentlemen:

         In connection with its proposed purchase of Warrants (the "Warrants")
which represent the right to call $______________ aggregate Unit Principal
Balance of SATURNS 2003-17 AT&T Corp. Debenture-Backed Class A Units and the
Applicable Class B Equivalent Amount of SATURNS 2003-17 AT&T Corp.
Debenture-Backed Class B Units, the undersigned transferee (the "Transferee")
confirms that:

         1. The Transferee understands that substantial risks are involved in an
investment in the Warrants. The Transferee represents that in making its
investment decision to acquire the Warrants, the Transferee has not relied on
representations, warranties, opinions, projections, financial or other
information or analysis, if any, supplied to it by any person, including MS&Co.,
MS Structured Asset Corp., as depositor (the "Depositor"), or LaSalle Bank
National Association, as trustee (the "Trustee"), or any of your or their
affiliates, except as expressly contained in written information, if any. The
Transferee has such knowledge and experience in financial and business matters
as to be capable of evaluating the merits and risks of an investment in the
Warrants, and the Transferee is able to bear the substantial economic risks of
such an investment. The Transferee has relied upon its own tax, legal and
financial advisors in connection with its decision to purchase the Warrants.

         2. Such Transferee (A) is a "qualified institutional buyer" (as defined
in Rule 144A of the Securities Act) that (1) is not a broker-dealer that owns
and invests on a discretionary basis less than $25 million in securities of
issuers that are not affiliated persons of the dealer and (2) is not a plan
referred to in paragraph (a)(1)(i)(D) or (a)(1)(i)(E) of Rule 144A or a trust
fund referred to in paragraph (a)(1)(i)(F) of Rule 144A that holds the assets of
such a plan, if investment decisions with respect to the plan are made by the
beneficiaries of the plan, (B) is aware that the sale or transfer of the
Warrants to it may be made to it in reliance on the exemption from registration
provided by Rule 144A under the Securities Act and (C) is acquiring the Warrants
for its own account or for one or more accounts, each of which is a qualified
institutional buyer, and as to each of which the Transferee exercises sole
investment discretion, and in each case in accordance with any applicable
securities laws of any state of the United States and other jurisdictions.

         3. The Transferee understands that the Warrants have not been and will
not be registered under the 1933 Act or under the securities or blue sky laws of
any state, and that (i) if it decides to resell, pledge or otherwise transfer
any Security, such resale, pledge or other transfer must comply with the
provisions of the Trust Agreement relating to the Warrants and (ii) it will, and
each subsequent holder will be required to, notify any purchaser of any Warrant
from it of the resale restrictions in the Trust Agreement.

         4. The Transferee understands that each of the Warrants will bear a
legend substantially to the following effect, unless otherwise agreed by the
Depositor and the Trustee:

                  EACH PURCHASER OR OTHER TRANSFEREE OF THIS WARRANT OR ANY
INTEREST HEREIN OF THIS WARRANT, BY ITS ACCEPTANCE HEREOF, IS DEEMED TO
REPRESENT AND WARRANT FOR THE BENEFIT OF THE TRUSTEE AND THE DEPOSITOR OF THE
TRUST, AND EACH DISTRIBUTION PARTICIPANT AS DEFINED IN THE TRUST AGREEMENT THAT
SUCH PURCHASER OR OTHER TRANSFEREE IS A "QUALIFIED INSTITUTIONAL BUYER" AS
DEFINED IN RULE 144A UNDER THE SECURITIES ACT.

                  THE HOLDER, AND EACH FIDUCIARY WHICH CAUSES ANY PERSON TO
ACQUIRE ANY WARRANT, IN ITS INDIVIDUAL AS WELL AS ITS FIDUCIARY CAPACITY, WILL
BE DEEMED BY SUCH PURCHASE, HOLDING OR ACQUISITION, ON EACH DATE ON WHICH THE
WARRANT IS HELD BY SUCH PERSON, TO HAVE REPRESENTED THAT IT IS NOT A (I)
"EMPLOYEE BENEFIT PLAN" (AS DEFINED IN SECTION 3(3) OF THE EMPLOYEE RETIREMENT
INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA")) SUBJECT TO THE FIDUCIARY
RESPONSIBILITY PROVISIONS OF TITLE I OF ERISA, (II) "PLAN" DESCRIBED IN SECTION
4975(E)(1) OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE "CODE") SUBJECT
TO SECTION 4975 OF THE CODE, (III) ENTITY WHOSE UNDERLYING ASSETS INCLUDE PLAN
ASSETS BY REASON OF A PLAN'S INVESTMENT IN SUCH ENTITY OR OTHERWISE OR (IV)
GOVERNMENTAL OR OTHER PLAN SUBJECT TO REQUIREMENTS SUBSTANTIALLY SIMILAR TO
TITLE I OF ERISA OR SECTION 4975 OF THE INTERNAL REVENUE CODE.

                  EACH PERSON THAT ACQUIRES A WARRANT, AND EACH FIDUCIARY WHO
CAUSES A PERSON TO ACQUIRE A WARRANT, IN ITS INDIVIDUAL AS WELL AS ITS FIDUCIARY
CAPACITY, AGREES TO INDEMNIFY AND HOLD HARMLESS THE DEPOSITOR, THE TRUSTEE, THE
WARRANT AGENT, MS&CO. AND THEIR RESPECTIVE AFFILIATES FROM ANY COST, DAMAGES,
LOSS OR EXPENSE, INCURRED BY THEM AS A RESULT OF THE REPRESENTATIONS MADE BY
SUCH PERSON OR FIDUCIARY IN THIS PARAGRAPH NOT BEING TRUE.

                  THIS WARRANT MAY BE SUBJECT TO ADDITIONAL RESTRICTIONS ON
TRANSFER AS PROVIDED IN THE TRUST AGREEMENT FOR THE TRUST TO WHICH THIS WARRANT
RELATES.

                  Any purported transfer of this Warrant certificate (or any
interest herein) in violation of Section 3.2(a)(1) or Section 3.2(a)(2) of
schedule iii to the trust agreement shall be void ab initio and the purported
transferee in such transfer shall not be recognized by any Person as a holder of
such Warrants for any purpose. The Depositor and the Trustee shall each have the
power to sell the Warrants (or any interest herein) of a purported Warrantholder
(or owner of any interest herein) who acquired its interest in violation of
Section 3.2(a)(1) or Section 3.2(a)(2) of schedule iii to the trust agreement or
who continues to hold Warrants in violation of Section 3.2(a)(2) of schedule iii
of the trust agreement.

                  THIS WARRANT SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF NEW YORK AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES
HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

         5. The Transferee and each fiduciary which causes the Transferee to
acquire any Warrant, in its individual as well as its fiduciary capacity,
represents and agrees that the Transferee is NOT a Plan, is NOT a governmental
or other plan subject to restrictions substantially similar to Title I of ERISA
or Section 4975 of the Code, and is NOT acquiring the Warrants with the assets
of any such Plan or other plan. The Transferee and each such fiduciary
understands that the representations made in this section 5 will be deemed made
on each day from the date hereof through and including the date on which the
Transferee disposes of the Warrants. The Transferee and each fiduciary who
causes the Transferee to acquire a Warrant, in its individual as well as its
fiduciary capacity, agrees to indemnify and hold harmless the Depositor, the
Trustee, the Warrant Agent, MS&Co., each Distribution Participant and their
respective affiliates from any cost, damages, loss or expense, incurred by them
as a result of the representations made in this paragraph not being true.

         6. The Transferee understands that no subsequent transfer of the
Warrants is permitted unless such transfer is to a transferee who will own,
after giving effect to such transfer and any other simultaneous transfers, at
least 250 Warrants and the Transferee causes the proposed transferee to provide
to the Depositor and the Trustee such documentation as may be required pursuant
to Section 3.2 of the Warrant Agent Agreement, including, if required, a letter
substantially in the form hereof, or such other written statement as the
Depositor shall reasonably prescribe.

         7. The Transferee is a Person who is either:

         A. (1) a citizen or resident of the United States, (2) a corporation,
partnership or other entity organized in or under the laws of the United States
or any political subdivision thereof, or (3) an estate the income of which is
includible in gross income for federal income tax purposes regardless of source,
or (4) a trust if a court within the United States is able to exercise primary
supervision of the administration of the trust and one or more United States
persons have the authority to control all substantial decisions of the trust, or

         B. a Person not described in (A), whose ownership of such Warrant is
effectively connected with such Person's conduct of a trade or business within
the United States within the meaning of the Internal Revenue Code of 1986, as
amended (the "Code"), and its ownership of any interest in such Warrant will not
result in any withholding obligation with respect to any payments with respect
to the Warrants by any Person (other than withholding, if any, under Section
1446 of the Code), or

         C. a Person not described in (A) or (B) above, who is not a Person: (1)
that owns, directly or indirectly, 10% or more of the total combined voting
power of all classes of stock in the Underlying Securities Issuer (as defined in
Schedule II to the Trust Agreement) entitled to vote, (2) that is a controlled
foreign corporation related to the Underlying Securities Issuer within the
meaning of Section 864(d)(4) of the Code, or (3) that is a bank extending credit
pursuant to a loan agreement entered into in the ordinary course of its trade or
business.

         8. The Transferee agrees that (i) if it is a Person described in clause
(A) above, it will furnish to the Depositor and the Trustee a properly executed
IRS Form W-9, and (ii) if it is a Person described in clause (B) above, it will
furnish to the Depositor and the Trustee a properly executed IRS Form W-8ECI,
and (iii) if it is a Person described in clause (C) above, it will furnish to
the Depositor and the Trustee a properly executed IRS Form W-8BEN (or, if the
Transferee is treated as a partnership for federal income tax purposes, a
properly executed IRS Form W-8IMY with appropriate certification for all
partners or members attached). The Transferee also agrees that it will provide a
new IRS form upon the expiration or obsolescence of any previously delivered
form, and that it will provide such other certifications, representations or
Opinions of Counsel as may be requested by the Depositor and the Trustee.

         9. The Transferee understands that any acquisition of Warrants (or any
interest therein) in violation of Section 3.2(a)(1) (addressed in paragraph 2
hereof) or Section 3.2(a)(2) (addressed in paragraph 5 hereof) of Schedule III
to the Trust Agreement shall be void ab initio and the purported transferee in
such transfer shall not be recognized by any Person as a holder of such Warrants
for any purpose. The Transferee understands that the Depositor and the Trustee
shall each have the power to sell the Warrants (or any interest therein) of a
purported Warrantholder (or owner of any interest therein) who acquired its
interest in violation of Section 3.2(a)(1) or Section 3.2(a)(2) of Schedule III
to the Trust Agreement or who continues to hold Warrants in violation of Section
3.2(a)(2) of Schedule III to the Trust Agreement.

<PAGE>


         You and the Trustee are entitled to rely upon this letter and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any administrative or legal proceeding or official inquiry with respect
to the matters covered hereby.

                                           Very truly yours,

                                           [Name of Transferee]



                                           By:
                                               --------------------------------
                                           Name:
                                           Title:


Registered Name:
                --------------------------

Address:
        ----------------------------------

        ----------------------------------

Payment Instructions:
                     ---------------------