EXHIBIT 10.1

PANACOS PHARMACEUTICALS, INC.

1998 Equity Incentive Plan

(as amended and restated as of June 12, 2007)

Section 1.Purpose

The purpose of the Panacos Pharmaceuticals, Inc. 1998 Equity Incentive Plan (the
Plan) is to attract and retain key employees and directors and consultants of the Company and its Affiliates, to provide an incentive for them to achieve long-range performance goals, and to enable them to participate in the long-term
growth of the Company by granting Awards with respect to the Companys Common Stock.

Section 2. Definitions

Affiliate means any business entity in which the Company owns directly or indirectly 50% or more of the total combined voting power or has
a significant financial interest as determined by the Committee.

Award means any Option, Stock Appreciation Right, Performance Share,
Restricted Stock, Stock Unit or Other Stock-Based Award awarded under the Plan.

Board means the Board of Directors of the Company.

Code means the Internal Revenue Code of 1986, as amended from time to time, and any successor to such Code.

Committee means a committee comprised of not less than two members of the Board appointed by the Board to administer the Plan or a specified portion thereof.
If the Committee is authorized to grant Awards to a Reporting Person or a Covered Employee, each member shall be a Non-Employee Director or the equivalent within the meaning of Rule 16b-3 under the Securities Exchange Act of 1934 or any
successor provision, as applicable to the Company at the time (Rule16b-3), or an outside director or the equivalent within the meaning of Section 162(m) of the Code, respectively. In the event no such Committee is
appointed, then Committee means the Board.

Common Stock or Stock means the Common Stock, $0.01 par value, of the
Company.

Company means Panacos Pharmaceuticals, Inc.

Covered Employee means a person whose income is subject to Section 162(m) of the Code.

Designated Beneficiary means
the beneficiary designated by a Participant, in a manner determined by the Committee, to receive amounts due or exercise rights of the Participant in the event of the Participants death. In the absence of an effective designation by a
Participant, Designated Beneficiary shall mean the Participants estate.

Effective Date means January 25, 1996.

Fair Market Value of a Share of Common Stock means:



| | (1) | If the Common Stock is listed on a national securities exchange or traded in the over-the-counter market and sales prices are regularly reported for the Common Stock, the closing or
last price of the Common Stock on the composite tape or other comparable reporting system for the trading day on the applicable date and if such applicable date is not a trading day, the last market trading day prior to such date;
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| | (2) | If the Common Stock is not traded on a national securities exchange but is traded on the over-the-counter market, if sales prices are not regularly reported for the Common Stock for
the trading day referred to in clause (1), and if bid and asked prices for the Common Stock are regularly reported, the mean between the bid and the asked price for the Common Stock at the close of trading in the over-the-counter market for the
trading day on which Common Stock was traded on the applicable date and if such applicable date is not a trading day, the last market trading day prior to such date; and
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| | (3) | If the Common Stock is neither listed on a national securities exchange nor traded in the over-the-counter market, such value as the Board of Directors of the Company, in good
faith, shall determine.
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Incentive Stock Option means an option to purchase shares of Common Stock awarded to a Participant under
Section 6 that is intended to meet the requirements of Section 422 of the Code or any successor provision.

Nonstatutory Stock Option
means an option to purchase shares of Common Stock awarded to a Participant under Section 6 that is not intended to be an Incentive Stock Option.

Option means an Incentive Stock Option or a Nonstatutory Stock Option.

Other Stock-Based Award means an Award, other than
an Option, Stock Appreciation Right, Performance Share, Restricted Stock or Stock Unit, having a Common Stock element and awarded to a Participant under Section 11.

Participant means a person selected by the Committee to receive an Award under the Plan.

Performance
Cycle or Cycle means the period of time selected by the Committee during which performance is measured for the purpose of determining the extent to which an award of Performance Shares has been earned.

Performance Shares mean shares of Common Stock, which may be earned by the achievement of performance goals, awarded to a Participant under Section 8.

Reporting Person means a person subject to Section 16 of the Securities Exchange Act of 1934 or any successor provision.

Restricted Period means the period of time during which an Award may be forfeited to the Company pursuant to the terms and conditions of such Award.

Restricted Stock means shares of Common Stock subject to forfeiture awarded to a Participant under Section 9.

Stock Appreciation Right or SAR means a right to receive any excess in value of shares of Common Stock over the exercise price awarded to a
Participant under Section 7.

Stock Unit means an award of Common Stock or units that are valued in whole or in part by reference to, or
otherwise based on, the value of Common Stock, awarded to a Participant under Section 10.

Section 3.
Administration

The Plan shall be administered by the Committee, provided that the Board may in any instance perform any of the functions delegated
to the Committee hereunder. The Committee shall select the Participants to receive Awards and shall determine the terms and conditions of the Awards. The Committee shall have authority to adopt, alter and repeal such administrative rules, guidelines
and practices governing the operation of the Plan as it shall from time to time consider advisable, and to interpret the provisions of the Plan. The Committees decisions shall be final and binding. To the extent permitted by applicable law,
the Committee may delegate to



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one or more executive officers of the Company the power to make Awards to Participants who are not Reporting Persons and all determinations under the Plan
with respect thereto, provided that the Committee shall fix the maximum amount of such Awards for all such Participants and a maximum for any one Participant.

Section 4. Eligibility

All
employees and, in the case of Awards other than Incentive Stock Options, Directors and consultants of the Company or any Affiliate, capable of contributing significantly to the successful performance of the Company, other than a person who has
irrevocably elected not to be eligible, are eligible to be Participants in the Plan. Incentive Stock Options may be awarded only to persons eligible to receive such Options under the Code.

Section 5. Stock Available for Awards



|(a) | Subject to adjustment under subsection (b), Awards may be made under the Plan for up to 4,750,000 shares of Common Stock. If any Award in respect of shares of Common Stock expires
or is terminated unexercised or is forfeited, the shares subject to such Award, to the extent of such expiration, termination or forfeiture, shall again be available for award under the Plan. Common Stock issued through the assumption or
substitution of outstanding grants from an acquired company shall not reduce the shares available for Awards under the Plan. Shares issued under the Plan may consist in whole or in part of authorized but unissued shares or treasury shares.
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|(b) | In the event that the Committee determines that any stock dividend, extraordinary cash dividend, creation of a class of equity securities, recapitalization, reorganization, merger,
consolidation, split-up, spin-off, combination, exchange of shares, warrants or rights offering to purchase Common Stock at a price substantially below fair market value, or other similar transaction affects the Common Stock such that an adjustment
is required in order to preserve the benefits or potential benefits intended to be made available under the Plan, then the Committee (subject, in the case of Incentive Stock Options, to any limitation required under the Code) shall equitably adjust
any or all of (i) the number and kind of shares in respect of which Awards may be made under the Plan, (ii) the number and kind of shares subject to outstanding Awards, and (iii) the award, exercise or conversion price with respect to
any of the foregoing, and if considered appropriate, the Committee may make provision for a cash payment with respect to an outstanding Award, provided that the number of shares subject to any Award shall always be a whole number.
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Section 6. Stock Options



|(a) | Subject to the provisions of the Plan, the Committee may award Incentive Stock Options and Nonstatutory Stock Options and determine the number of shares to be covered by each
Option, the option price therefor and the conditions and limitations applicable to the exercise of the Option. The Committee may impose such conditions with respect to the exercise of Options, including conditions relating to applicable federal and
state securities laws, as it considers necessary or advisable. The terms and conditions of Incentive Stock Options shall be subject to and comply with Section 422 of the Code or any successor provision and any regulations thereunder, and no
Incentive Stock Option may be granted hereunder more than ten years after the Effective Date.
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|(b) | The Committee shall establish the option price at the time each Option is awarded, which price shall not be less than 100% of the Fair Market Value of the Common Stock on the date
of award with respect to Incentive Stock Options. Nonstatutory Stock Options may be granted at such prices as the Committee may determine.
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|(c) | Until the completion of an initial public offering of the Common Stock, each optionholder shall execute a Stock Purchase and Right of Repurchase Agreement,
substantially in the form of Exhibit 1 hereto, prior to the purchase of any Stock pursuant to the exercise of Options. Each Option shall be exercisable at such times and subject to such additional terms and conditions as the Committee may specify in
the applicable
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| | Award or thereafter. The Committee may impose such conditions with respect to the exercise of Options, including conditions relating to applicable federal or
state securities laws, as it considers necessary or advisable.
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|(d) | No shares shall be delivered pursuant to any exercise of an Option until payment in full of the option price therefor is received by the Company. Such payment may be made in whole
or in part in cash or, to the extent permitted by the Committee at or after the award of the Option, by delivery of a note or shares of Common Stock owned by the optionee, including Restricted Stock, or by retaining shares otherwise issuable
pursuant to the Option, in each case valued at their Fair Market Value on the date of delivery or retention, or such other lawful consideration as the Committee may determine.
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|(e) | The Committee may provide that, subject to such conditions as it considers appropriate, upon the delivery or retention of shares to the Company in payment of an Option, the
Participant automatically be awarded an Option for up to the number of shares so delivered.
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Section 7.
Stock Appreciation Rights



|(a) | Subject to the provisions of the Plan, the Committee may award SARs in tandem with an Option (at or after the award of the Option), or alone and unrelated to an Option. SARs in
tandem with an Option shall terminate to the extent that the related Option is exercised, and the related Option shall terminate to the extent that the tandem SARs are exercised. The Committee shall determine at the time of grant or thereafter
whether SARs are settled in cash, Common Stock or other securities of the Company, Awards or other property, and may define the manner of determining the excess in value of the shares of Common Stock.
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|(b) | The Committee shall fix the exercise price of each SAR or specify the manner in which the price shall be determined. SARs granted in tandem with Options shall have an exercise price
not less than the exercise price of the related Option. SARs granted alone and unrelated to an Option may not have an exercise price less than 100% of the Fair Market Value of the Common Stock on the date of grant, provided that such a SAR granted
to a new employee or consultant within 90 days of the date of employment may have a lower exercise price so long as it is not less than 100% of the Fair Market Value on the date of employment.
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|(c) | An SAR related to an Option, which SAR can only be exercised upon or during limited periods following a change in control of the Company, may entitle the Participant to receive an
amount based upon the highest price paid or offered for Common Stock in any transaction relating to the change in control or paid during the thirty-day period immediately preceding the occurrence of the change in control in any transaction reported
in the stock market in which the Common Stock is normally traded.
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Section 8. Performance Shares



|(a) | Subject to the provisions of the Plan, the Committee may award Performance Shares and determine the number of such shares for each Performance Cycle and the duration of each
Performance Cycle. There may be more than one Performance Cycle in existence at any one time, and the duration of Performance Cycles may differ from each other. The payment value of Performance Shares shall be equal to the Fair Market Value of the
Common Stock on the date the Performance Shares are earned or, in the discretion of the Committee, on the date the Committee determines that the Performance Shares have been earned.
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|(b) | The committee shall establish performance goals for each Cycle, for the purpose of determining the extent to which Performance Shares awarded for such Cycle are earned, on the basis
of such criteria and to accomplish such objectives as the Committee may from time to time select. During any Cycle, the Committee may adjust the performance goals for such Cycle as it deems equitable in recognition of unusual or non-recurring events
affecting the Company, changes in applicable tax laws or accounting principles, or such other factors as the Committee may determine.
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|(c) | As soon as practicable after the end of a Performance Cycle, the Committee shall determine the number of Performance Shares that have been earned on the basis of
performance in relation to the established
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| | performance goals. The payment values of earned Performance Shares shall be distributed to the Participant or, if the Participant has died, to the
Participants Designated Beneficiary, as soon as practicable thereafter. The Committee shall determine, at or after the time of award, whether payment values will be settled in whole or in part in cash or other property, including Common Stock
or Awards.
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Section 9. Restricted Stock



|(a) | Subject to the provisions of the Plan, the Committee may award shares of Restricted Stock and determine the duration of the Restricted Period during which, and the conditions under
which, the shares may be forfeited to the Company and the other terms and conditions of such Awards. Shares of Restricted Stock may be issued for no cash consideration or such minimum consideration as may be required by applicable law.
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|(b) | Shares of Restricted Stock may not be sold, assigned, transferred, pledged or otherwise encumbered, except as permitted by the Committee, during the Restricted Period.
Notwithstanding the foregoing, in the Committees discretion, Awards in the form of Restricted Stock may be made transferable to a limited liability company controlled solely by the Participant. Shares of Restricted Stock shall be evidenced in
such manner as the Committee may determine. Any certificates issued in respect of shares of Restricted Stock shall be registered in the name of the Participant and unless otherwise determined by the Committee, deposited by the Participant, together
with a stock power endorsed in blank, with the Company. At the expiration of the Restricted Period, the Company shall deliver such certificates to the Participant or if the Participant has died, to the Participants Designated Beneficiary.
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Section 10. Stock Units



|(a) | Subject to the provisions of the Plan, the Committee may award Stock Units subject to such terms, restrictions, conditions, performance criteria, vesting requirements and payment
rules as the Committee shall determine.
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|(b) | Shares of Common Stock awarded in connection with a Stock Unit Award shall be issued for no cash consideration or such minimum consideration as may be required by applicable law.
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Section 11. Other Stock-Based Awards



|(a) | Subject to the provisions of the Plan, the Committee may make other awards of Common Stock and other awards that are valued in whole or in part by reference to, or are otherwise
based on, Common Stock, including without limitation convertible preferred stock, convertible debentures, exchangeable securities and Common Stock awards or options. Other Stock-Based Awards may be granted either alone or in tandem with other Awards
granted under the Plan and/or cash awards made outside of the Plan.
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|(b) | The Committee may establish performance goals, which may be based on performance goals related to book value, subsidiary performance or such other criteria as the Committee may
determine, Restricted Periods, Performance Cycles, conversion prices, maturities and security, if any, for any Other Stock-Based Award. Other Stock-Based Awards may be sold to Participants at the face value thereof or any discount therefrom or
awarded for no consideration or such minimum consideration as may be required by applicable law.
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Section 12. General Provisions Applicable to Awards



|(a) | Limitations on Grants of Options and SARs. Subject to adjustment under Section 5(b), the number of shares subject to Options and SARs granted to any one individual during any
fiscal year may not exceed 223,613 shares.
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|(b) | Reporting Person Limitations. Notwithstanding any other provision of the Plan, to the extent required to qualify for the exemption provided by Rule 16b-3, Awards
made to a Reporting Person shall not be
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| | transferable by such person other than by will or the laws of descent and distribution or, if then permitted by Rule 16b-3, pursuant to a qualified domestic
relations order as defined in the Code or Title I of the Employee Retirement Income Security Act or the rules thereunder, and are exercisable during such persons lifetime only by such person or by such persons guardian or legal
representative.
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|(c) | Documentation. Each Award under the Plan shall be evidenced by a writing delivered to the Participant specifying the terms and conditions thereof and containing such other terms and
conditions not inconsistent with the provisions of the Plan as the Committee considers necessary or advisable to achieve the purposes of the Plan or to comply with applicable tax and regulatory laws and accounting principles.
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|(d) | Committee Discretion. Each type of Award may be made alone, in addition to or in relation to any other type of Award. The terms of each type of Award need not be identical, and the
Committee need not treat Participants uniformly. Except as otherwise provided by the Plan or a particular Award, any determination with respect to an Award may be made by the Committee at the time of award or at any time thereafter.
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|(e) | Settlement. The Committee shall determine whether Awards are settled in whole or in part in cash, Common Stock, other securities of the Company, Awards or other property. The
Committee may permit a Participant to defer all or any portion of a payment under the Plan, including the crediting of interest on deferred amounts denominated in cash and dividend equivalents on amounts denominated in Common Stock.
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|(f) | Dividends and Cash Awards. In the discretion of the Committee, any Award under the Plan may provide the Participant with (i) dividends or dividend equivalents payable currently
or deferred with or without interest, and (ii) cash payments in lieu of or in addition to an Award.
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|(g) | Termination of Employment. The Committee shall determine the effect on an Award of the disability, death, retirement or other termination of employment of a Participant and the
extent to which, and the period during which, the Participants legal representative, guardian or Designated Beneficiary may receive payment of an Award or exercise rights thereunder.
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|(h) | Change in Control. In order to preserve a Participants rights under an Award in the event of a change in control of the Company, the Committee in its discretion may, at the
time an Award is made or at any time thereafter, take one or more of the following actions: (i) provide for the acceleration of any time period relating to the exercise or realization of the Award, (ii) provide for the purchase of the
Award upon the Participants request for an amount of cash or other property that could have been received upon the exercise or realization of the Award had the Award been currently exercisable or payable, (iii) adjust the terms of the
Award in a manner determined by the Committee to reflect the change in control, (iv) cause the Award to be assumed, or new rights substituted therefor, by another entity, or (v) make such other provision as the Committee may consider
equitable and in the best interests of the Company.
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|(i) | Loans. The Committee may authorize the making of loans or cash payments to Participants in connection with any Award under the Plan, which loans may be secured by any security,
including Common Stock, underlying or related to such Award (provided that such Loan shall not exceed the Fair Market Value of the security subject to such Award), and which may be forgiven upon such terms and conditions as the Committee may
establish at the time of such loan or at any time thereafter.
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|(j) | Withholding Taxes. The Participant shall pay to the Company, or make provision satisfactory to the Committee for payment of, any taxes required by law to be withheld in respect of
Awards under the Plan no later than the date of the event creating the tax liability. In the Committees discretion, such tax obligations may be paid in whole or in part in shares of Common Stock, including shares retained from the Award
creating the tax obligation, valued at their Fair Market Value on the date of delivery. The Company and its Affiliates may, to the extent permitted by law, deduct any such tax obligations from any payment of any kind otherwise due to the
Participant.
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|(k) | Foreign Nationals. Awards may be made to Participants who are foreign nationals or employed outside the United States on such terms and conditions different from those specified in
the Plan as the Committee considers necessary or advisable to achieve the purposes of the Plan or to comply with applicable laws.
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|(l) | Amendment of Award. The Committee may amend, modify or terminate any outstanding Award, including substituting therefor another Award of the same or a different type, changing the
date of exercise or realization and converting an Incentive Stock Option to a Nonstatutory Stock Option, provided that the Participants consent to such action shall be required unless the Committee determines that the action, taking into
account any related action, would not materially and adversely affect the Participant.
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Section 13.
Miscellaneous



|(a) | No Right To Employment. No person shall have any claim or right to be granted an Award, and the grant of an Award shall not be construed as giving a Participant the right to
continued employment. The Company expressly reserves the right at any time to dismiss a Participant free from any liability or claim under the Plan, except as expressly provided in the applicable Award.
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|(b) | No Rights As Stockholder. Subject to the provisions of the applicable Award, no Participant or Designated Beneficiary shall have any rights as a stockholder with respect to any
shares of Common Stock to be distributed under the Plan until he or she becomes the holder thereof. A Participant to whom Common Stock is awarded shall be considered the holder of the Stock at the time of the Award except as otherwise provided in
the applicable Award.
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|(c) | Effective Date. The 1996 Equity Incentive Plan became effective on January 25, 1996. Subject to the approval of the Stockholders of the Company, this 1998 Equity Incentive
Plan, which amends and restates the 1996 Equity Incentive Plan, will become effective on February 18, 1998. Prior to such approval, Awards may be made under the Plan expressly subject to such approval.
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|(d) | Amendment of Plan. The Board may amend, suspend or terminate the Plan or any portion thereof at any time, subject to any stockholder approval that the Board determines to be
necessary or advisable.
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|(e) | Governing Law. The provisions of the Plan shall be governed by and interpreted in accordance with the laws of Delaware.
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