Document:

<PAGE>

                                                                   EXHIBIT 10(s)

AGREEMENT BETWEEN FABRICANTE Y COMERCIALIZADORA BETA, S.A. DE C.V. AND PRODUCTOS
                           QUIMICOS COIN, S.A. DE C.V.

<PAGE>

PRIVATE AGREEMENT ENTERED INTO ON THE ONE HAND BY FABRICANTE Y COMERCIALIZADORA
BETA, S.A. DE C.V., REPRESENTED HEREIN BY RAUL BAZ BARVILL, HEREINAFTER
"ASSIGNEE", AND ON THE OTHER HAND BY PRODUCTOS QUIMICOS COIN, S.A. DE C.V,
REPRESENTED HEREIN BY LETICIA GUERRERO GONZALEZ, HEREINAFTER "DEBTOR", PURSUANT
TO THE FOLLOWING RECITALS AND CLAUSES:

                                    RECITALS:

BY BOTH PARTIES:

1.- On May 19, 2005 they executed and ratified a Judicial Agreement in the court
records of special mortgage lawsuit marked as file 1710/95 before Civil Court
Forty-Second of the Federal District, hereinafter "THE JUDICIAL AGREEMENT",
Agreement and Attachments whereof copy duly signed by the parties is included
herewith as Attachment number "1".

2.- The above-mentioned "THE JUDICIAL AGREEMENT" is pending approval in virtue
that the Judge of Civil Court Forty-Second of the Federal District considered he
is not competent to approve the content of Clause Tenth dealing with labor
matters that are subject matter of this Private Agreement.

[STAMP]
<PAGE>

3.- The parties wish to bind themselves to the terms of the "THE JUDICIAL
AGREEMENT", having fulfilled some of the obligations established therein.

4.- To facilitate approval of "THE JUDICIAL AGREEMENT", the parties have decided
to file a brief before Civil Court Forty-Second of the Federal District, whereby
they leave without effect Clause Tenth of "THE JUDICIAL AGREEMENT", establishing
in this Agreement the same obligations as they originally established in Clause
Tenth of "THE JUDICIAL AGREEMENT".

                                    CLAUSES:

FIRST.- As of May 19, 2005, date when "THE JUDICIAL AGREEMENT", File number
1710/95 was signed and ratified before Civil Court Forty-Second of the Federal
District, date when "ASSIGNEE" received real and legal possession of the movable
and real estate assets referred to in Clause Seventh of "THE JUDICIAL
AGREEMENT", "ASSIGNEE" became substitute employer of all management and
unionized personnel who had been working for "DEBTOR" in the manufacturing plant
located at Fraccion del terreno ubicado en el"Camino Nuevo al Complejo
Petroquimico Morelos" y Vaso numero dos, del

[STAMP]

                                        2
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Municipio de Pajaritos, en Coatzacoalcos, Veracruz (official address also known
as Boulevar C.P.Q. la Cangrejera al C.P.Q., Morelos Km. 3, Coatzacoalcos,
Veracruz), workers listed in Attachment number "2", that signed by both parties
forms an integral part of this Agreement.

Additionally, as substitute employer, as of May 19, 2005 "ASSIGNEE" has assumed
all obligations and liabilities pending, past due and enforceable that result
against "DEBTOR" derived from labor relationships that resulted in the labor
lawsuits currently handled against "DEBTOR", for which data are specified in
Attachment number "2" of this Agreement, that having been signed by both parties
forms an integral part of this Private Agreement.

"ASSIGNEE" binds itself to present in the files related to labor processes
listed in Attachment number "2", copy of this Agreement and Attachments, and
keep follow-up over them, able to negotiate under terms as best suit "ASSIGNEE",
free of any liability whatsoever for "DEBTOR", and "ASSIGNEE" assumes the
obligation to face obligations derived from those relationships and labor
processes against "DEBTOR", and against its own equity.

[STAMP]

                                        3
<PAGE>

Consequently, effective as of May 19, 2005, "ASSIGNEE" assumes all liabilities
and obligations derived from individual and collective labor relationships that
exist in the plant located at Fraccion del terreno ubicado en el Camino Nuevo al
"Complejo Petroquimco Morelos" y Vaso numero dos, del Municipio de Pajaritos,
en Coatzacoalcos, Veracruz (official address also known as Boulevar C.P.Q. la
Cangrejera al C.P.Q., Morelos Km. 3, Coatzacoalcos, Veracruz) with the employees
listed in ATTACHMENT NUMBER "2", that having been signed by the parties forms an
integral part of this Private Agreement, obligations that include those derived
from the Collective Labor Contract and agreements executed with the Labor Union
of the Chemical, Petrochemical, Carbochemical, Similar and Related Industries of
the Mexican Republic, contracts and individual labor relationships, the Federal
Labor Law, IMSS (Mexican Social Security), INFONAVIT (Workers National Housing
Fund), SAR (Savings Retirement Fund) and other ordinances and applicable
regulations.

Effective as of May 19, 2005, date when "THE JUDICIAL AGREEMENT" was signed and
"ASSIGNEE" received real and legal possession of the movable and real estate
assets referred to an Clause Seventh of "THE JUDICIAL AGREEMENT", "ASSIGNEE"
binds itself to hold "DEBTOR" harmless with respect to labor relationships and
any conflict or lawsuit filed or initiated

[STAMP]

                                        4
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with aforementioned union, management and unionized employees, and in the labor
lawsuits mentioned in ATTACHMENT NUMBER "2, that having been signed by both
parties forms an integral part of this Private Agreement.

With the knowledge, participation and full consent by "ASSIGNEE", on May 19,
2005 "DEBTOR" ended the individual labor relationships and, with the legal
benefits, provided severance pay to its employees working in its office at
Avenida de las Fuentes 41-A, Despacho 504, Col. Lomas de Tecamachalco, C.P.
53950, Naucalpan, Edo. de Mexico, listed in Attachment number "3", that having
been signed by both parties forms and integral part of this Private Agreement,
and delivered to "ASSIGNEE" a hand signed copy with original stamp of each
termination agreement, record of ratification and approval before Special Board
Fifteen of the Federal Conciliation and Arbitration Board containing record of
termination of those labor relationships and of receipt of settlement.

The labor relationship with Armando Gonzalez Soriano who works for "DEBTOR" at
the address given in the above paragraph shall continue about 3 or 4 weeks more,
as this person has work in accounting records pending to be delivered to
"DEBTOR", and that when delivered and accepted, "DEBTOR"

[STAMP]

                                        5
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binds itself to terminate the individual labor relationship with that person and
give him his severance pay with the legal benefits, and deliver "ASSIGNEE" a
hand signed copy of documents evidencing the termination of such labor
relationship and receipt of severance pay.

"DEBTOR" binds to hold "ASSIGNEE" free of any labor lawsuit or conflict that
arising in relation to the employee mentioned in the preceding paragraph and the
employees listed in Attachment number "3", that having been signed by the
parties forms and integral part of this Private Agreement.

SECOND.- The parties agree that if due to any circumstance "DEBTOR" were obliged
to make any payment derived from the labor relationships or lawsuits which
"ASSIGNEE" assumes on this date and referred to in Clause First, "DEBTOR" shall
be entitled to claim reimbursement by "ASSIGNEE" of amounts which it may have
paid.

THIRD. For purposes of this Agreement the parties provide the following official
address:

"ASSIGNEE" : Boulevard Avila Camacho 4194, Planta Baja, Colenia Jardines del
Pedregal, C.P. 01900, in this City of Mexico Federal District.

[STAMP]

                                        6
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"DEBTOR": Avenida de las Fuentes 41-A, despacho 503, Colonia Lomas de
Tecamachalco, C.P. 53950, Naucalpan, Estado de Mexico.

FOURTH. For all matters regarding construction and fulfillment of this Agreement
the parties expressly bind themselves to laws and courts of the City of Mexico,
Federal District, and waive any other forum that might further correspond to
them by reason of their official address.

This Private Agreement is signed in the City of Mexico, Federal District, on the
sixth day of June of two thousand five.

"ASSIGNEE"                                           "DEBTOR"
FABRICANTE Y COMERCIALIZADORA                        PRODUCTOS QUIMICOS COIN,
BETA, S.A. DE C.V.                                   S.A. DE C.V.
(ILLEGIBLE SIGNATURE)                                (ILLEGIBLE SIGNATURE)
----------------------                               ------------------------
RAUL BAZ HARVILL,                                    LETICIA GUERRERO GONZALEZ
CHIEF EXECUTIVE OFFICER                              LEGAL REPRESENTATIVE

[STAMP]

                                        7
<PAGE>

The undersigned, Kristin Dagny O'Hea de Langarica, Litorales 69, Col. Las
Aguilas, Mexico, D.F., 5593-0471, who have been authorized by the Federal
Judiciary Council (Consejo de la Judicatura Federal) to act as an expert
translator before all courts belonging to the Judicial Branch of the Federal
Government of Mexico, certify that the foregoing is a true and exact translation
of the attached document. Mexico, D.F., June 21, 2005.

/s/ Kristin Dagny O'Hea de Langarica
-------------------------------
Kristin Dagny O'Hea de Langarica

<PAGE>

                               ATTACHMENT NUMBER 2

<PAGE>

                               ATTACHMENT NUMBER 2

ATTACHMENT NUMBER 2 FORMING PART OF PRIVATE AGREEMENT EXECUTED BY AND BETWEEN
FABRICANTE Y COMERCIALIZADORA BETA, S.A. DE C.V., ("ASSIGNEE"), AND PRODUCTOS
QUIMICOS COIN, S.A. DE C.V, ("DEBTOR"), ON THIS DAY, JUNE 6, 2005.

List of employees working for "DEBTOR" in the manufacturing plant located at
Fraccion de Terreno ubicado en el Camino Nuevo al "Complejo Petroquimico
Morelos" y Vaso numero dos, Municipio de Pajaritos, Coatzacoalcos, Veracruz
(address also known as Boulevard C.P.Q. la Cangrejera al C.P.Q. Morelos Km 3,
Coatzacoalcos, Veracruz).

UNIONIZED WORKERS:

      1. Leandro Canseco Navarrete

      2. Felipe de Jesus Guzman Hipolito

      3. Emilio Garcia Ruiz

      4. Flavio Reyes Alvarez

      5. Cristobal Sarate Estudillo

      6. Ceferino Antonio De La Cruz

      7. Adolfo Ruiz Sanchez

      8. Israel  Salgado Montalvo

      9. Christian Slee Gutierrez Alvarez

[STAMP]
<PAGE>

MANAGEMENT EMPLOYEES:

      1. Manuel Resales Robles

      2. Ma. Del Rosario Vasquez H.

      3. Sergio Omar Mendoza Zuart

      4. Jaime Avila Solis

      5. Carlos Alberto Farfan

      6. Tomas Martinez Facundo

      7. Edgar Villegas Pineda

      8. Dante Cuauhtemoc Soto

      9. Jorge Ernesto Vazquez

LIST OF LABOR LAWSUITS AGAINST "DEBTOR", PRODUCTOS QUIMICOS COIN, S.A. DE C.V.

      1. File 40/2001

         Plaintiff: Jorge Acevedo Morales

      2. File: 179/2001

         Plaintiff: Jorge Acevedo Morales

      3. File 65/2001

         Plaintiff: Aparicio Zacarias Hernandez

      4. File: 122/2001

         Plaintiff: Jose Manuel Acevedo Morales

[STAMP]

                                        2
<PAGE>

      5. File 421/2001

         Plaintiff: Jose Manuel Acevedo Morales

      6. File: 145/2001

         Plaintiff: Antonio Mardueno Velasquez and
         Arnulfo Hernandez Ronquillo

      7. File: 203/2001

         Plaintiff: Jaime Katz Ramirez

      8. File: 63/2002

         Plaintiff: Raciel Rosete Vidal

      9. File: 746/2002

         Plaintiff: Raciel Rosete Vidal

This Attachment is signed in the City of Mexico, Federal District, on June sixth
of two thousand five.

"ASSIGNEE"                                          "DEBTOR"
FABRICANTE Y COMERCIALIZADORA                       PRODUCTOS QUIMICOS COIN,
BETA, S.A. DE C.V.                                  S.A. DE C.V.
(illegible signature)                               (illegible signature)
----------------------------                        --------------------------
RAUL BAZ HARVILL,                                   LETICIA GUERRERO GONZALEZ
LEGAL PRESENTATIVE                                  LEGAL REPRESENTATIVE

[STAMP]

                                        3
<PAGE>

The undersigned, Kristin Dagny O'Hea de Langarica, Litorales 69, Col. Las
Aguilas, Mexico, D.F., 5593-0471, who have been authorized by the Federal
Judiciary Council (Consejo de la Judicatura Federal) to act as an expert
translator before all courts belonging to the Judicial Branch of the Federal
Government of Mexico, certify that the foregoing is a true and exact translation
of the attached document.

Mexico, D.F., June 21, 2005.

/s/ Kristin Dagny O'Hea de Langarica
-------------------------------------
Kristin Dagny O'Hea de Langarica

<PAGE>

                               ATTACHMENT NUMBER 3

<PAGE>

                               ATTACHMENT NUMBER 3

ATTACHMENT NUMBER 3 FORMING AN INTEGRAL PART OF PRIVATE AGREEMENT EXECUTED BY
AND BETWEEN FABRICANTE Y COMERCIALIZADORA BETA, S.A. DE C.V., ("ASSIGNEE"), AND
PRODUCTOS QUIMICOS COIN, S.A. DE C.V., ("DEBTOR), ON THIS DAY, JUNE 6, 2005.

List of employees who worked for "DEBTOR" in its office located at Avenida de
las Fuentes 41-A, Despacho 504, Col. Lomas de Tecamachalco, C.P., 53950,
Naucalpan, Edo. de Mexico and who stopped working on May 18, 2005 through
agreement signed with respect to the contract and individual labor relationship
that linked them to "DEBTOR".

      1. Maria Teresa Terrazas Moreno

      2. Juan Martin Velasco Gonzalez

      3. Lourdes Minero Hernandez

      4. Ricardo Ayala Garcia

      5. Daniela Andrea Mendoza Zaldivar

This Attachment is signed in the City of Mexico, Federal District, on June sixth
of two thousand five.

[STAMP]
<PAGE>

"ASSIGNEE"                                           "DEBTOR"
FABRICANTE Y COMERCIALIZADORA                        PRODUCTOS QUIMICOS COIN,
BETA, S.A. DE C.V.                                   S.A. DE C.V.
(illegible signature)                                (illegible signature)
----------------------------                         ---------------------------
RAUL BAZ HARVILL                                     LETICIA GUERRERO GONZALEZ
LEGAL REPRESENTATIVE                                 LEGAL REPRESENTATIVE

[STAMP]

                                        2
<PAGE>

The undersigned, Kristin Dagny O'Hea de Langarica, Litorales 69, Col. Las
Aguilas, Mexico, D.F., 5593-0471, who have been authorized by the Federal
Judiciary Council (Consejo de la Judicatura Federal) to act as an expert
translator before all courts belonging to the Judicial Branch of the Federal
Government of Mexico, certify that the foregoing is a true and exact translation
of the attached document.

Mexico, D.F., June 21, 2005.

/s/ Kristin Dagny O'Hea de Langarica
---------------------------------------
Kristin Dagny O'Hea de Langarica<PAGE>

                                                                   EXHIBIT 10(t)

                 MERCANTILE SHARES PURCHASE AND SALE AGREEMENT

<PAGE>

MERCANTILE SHARES PURCHASE AND SALE AGREEMENT (THE "AGREEMENT") EXECUTED IN THE
CITY OF MEXICO FEDERAL DISTRICT ON JUNE 9, 2005 TOGETHER WITH THE WITNESSES WHO
AFFIX THEIR SIGNATURES AT THE FOOT, BY AND BETWEEN

(I)   NICHOLAS N. CARTER, ON HIS OWN RIGHT AND THE LEGAL ENTITY, TEXAS OIL &
      CHEMICAL CO. II, INC., REPRESENTED HEREIN BY NICHOLAS N. CARTER,
      HEREINAFTER JOINTLY "SELLERS", AND

(II)  ERNESTO JAVIER GONZALEZ CASTRO AND MAURICIO RAMON AREVALO MERCADO,
      HEREINAFTER JOINTLY "BUYERS",

PURSUANT TO THE FOLLOWING REPRESENTATIONS AND CLAUSES:

                                 REPRESENTATIONS

I. BY SELLERS:

(a) Texas Oil & Chemical Co. II, Inc., through its representative:

(i) That it is a corporation organized in accordance with the laws of the United
States of America, with the legal capacity legitimation and authorizations
necessary to execute this AGREEMENT and bind itself to the terms hereof;

                                     [STAMP]

<PAGE>

(b) Nicholas N. Carter:

(i) That he enjoys full capacity to execute and deliver this Agreement.

(c) Both, jointly:

(i) That they are the legitimate owners in possession and full domain of
59,987,764 (FIFTY NINE MILLION NINE HUNDRED EIGHTY-SEVEN THOUSAND SEVEN HUNDRED
SIXTY-FOUR) ordinary, registered shares with a face value of P$1.00 (One Peso
00/100 Mexican Currency) each, fully subscribed and paid (the "SHARES")
representing issued, subscribed and paid capital stock of the business
corporation named PRODUCTOS QUIMICOS COIN, S.A. DE C.V. ("ISSUER)), represented
and distributed as follows:

<TABLE>
<CAPTION>
                                                    SHARES OF
                                SHARES OF FIXED  VARIABLE CAPITAL       TOTAL
       SHAREHOLDER               CAPITAL STOCK        STOCK        (VALUE IN PESOS)
-----------------------------   ---------------  ----------------  ----------------
<S>                             <C>              <C>               <C>
Texas Oil & Chemical Co. II,             99,999        59,987,764     60,087,763.00
Inc. represented by Nicholas
N. Carter

Nicholas N. Carter                            1                                1.00

            Total                       100,000        59,987,764     60,087,764.00
</TABLE>

Per this date the SHARES represent 100% (one hundred percent) of the subscribed
and paid capital stock of the ISSUER.

(ii) Per this date they have in their possession the certificates of the SHARES,
which they declare under oath are

                                     [STAMP]

                                        2

<PAGE>

not subject to lien, attachment, or any act or legal fact that in any manner
limits their authority for being disposed of.

(iii) ISSUER is legally organized in accordance with the laws of the United
Mexican States and its main purpose is the acquisition, lease or through any
title enjoyment of the use and possession of movable and real estate properties.

(iv) In virtue of the above representations and of the manifestations set forth
in Clause Third of the AGREEMENT, they wish to sell the SHARES to BUYERS in the
proportions further itemized, in the understanding that they represent 100% (one
hundred percent) of the issued and paid capital stock of ISSUER.

(v) For purposes of the transaction set forth in this instrument, each of them
individually and with respect to the shares held by the other, waive in favor of
the BUYERS the preemptive right granted to them under the Bylaws in effect of
ISSUER.

II BUYERS REPRESENT:

(a) That they are Mexican individuals, of age, with full

                                     [STAMP]

                                        3

<PAGE>

capacity to execute and deliver this Agreement.

(b) They wish to acquire the SHARES from SELLERS - in the proportions further
established -, subject to the conditions and terms of the AGREEMENT.

(c) Per this date they have inspected to their satisfaction all the legal,
accounting, tax and financial documents of ISSUER provided by SELLERS, and
consequently wish to acquire the SHARES.

Based on the above Representations, the parties execute the Agreement contained
in the following:

                                    CLAUSES:

FIRST: PURPOSE OF THE AGREEMENT. By virtue of the AGREEMENT, SELLERS sell,
assign and transfer the SHARES to BUYERS, and the latter buy and acquire the
SHARES for themselves, free of any burden, lien or affectation, in the following
proportions:

                                     [STAMP]

                                        4

<PAGE>

<TABLE>
<CAPTION>
                              SHARES OF FIXED  SHARES OF VARIABLE        TOTAL
         SHAREHOLDER           CAPITAL STOCK     CAPITAL STOCK     (VALUE IN PESOS)
----------------------------  ---------------  ------------------  ----------------
<S>                           <C>              <C>                 <C>
Texas Oil & Chemical Co. II,           99,998          59,987,764   60,087, 762 .00
Inc. represented by Nicholas
N. Carter

Nicholas N. Carter                          2                                  2.00

       Total                         100, 000          59,987,764     60,087,764.00
</TABLE>

SECOND: PRICE OF THE SHARES AND PAYMENT FORM: The price agreed for transfer of
the SHARES is the total amount of P$200.00 (Two Hundred Pesos Mexican Currency),
payable upon signing the AGREEMENT against delivery by SELLERS to BUYERS of the
shares certificates covering ownership of the SHARES, duly endorsed.

THIRD: REPRESENTATIONS; SELLERS jointly declare and warrant to BUYERS that the
AGREEMENT constitutes valid and enforceable obligations for SELLERS. Neither
subscription of the AGREEMENT nor fulfillment by SELLERS of any of the
provisions set forth in it: (i) shall breach, cause conflict or result in
nonperformance, early termination or rescission of any agreement, commitment or
obligation, or any other agreement where the ISSUER is party of or whereby
ISSUER or its properties or assets are bound, (ii) breach, cause conflict or
result in nonperformance of any agreement, commitment, obligation of an
agreement where SELLERS are a party of or whereby their properties or assets are
bound, and

                                     [STAMP]

                                        5

<PAGE>

such breach or nonperformance might produce a right for any third party over the
SHARES, (iii) breach any law or regulatory provision to which ISSUER is bound,
or breach, cause conflict or result in nonperformance by ISSUER; (iv) breach any
provision of the documents of incorporation of ISSUER, nor (v) result in
creating any lien (or any obligation to create any lien) over the properties or
assets of ISSUER.

Additionally, SELLERS represent and warrant to BUYERS the following:

1. Tax Matters: For purposes of the AGREEMENT, "Tax or Taxes" shall mean any tax
on income, on gross income, profits, franchises, licenses, transfers, sales,
use, ad valorem, customs, payrolls, withholding, employment, occupation, assets
(movable or real estate properties), on use or added value, assets tax and other
taxes, government charges, fees, contributions, withholdings, including but not
limited to fees to the Mexican Social Security, the Retirement Savings System
and Infonavit (Workers National Housing Fund), (including interest, sanctions or
additions to those Headings).

(a) ISSUER has provided BUYERS copies of the most recent

                                     [STAMP]

                                        6

<PAGE>

general balance sheets, statements of profit and loss, net worth and cash flow
of ISSUER (altogether the "Financial Statements") and corresponding tax
statements for those periods (altogether the "Tax Statements"). Expect for the
indications provided in them, those financial Statements are complete and
correct, and were prepared according to accounting principles generally accepted
in Mexico and consistently applied during such periods, and they adequately
reflect the financial condition of ISSUER per those dates:

(b) All Tax Statements have been duly or spontaneously filed;

(c) All Taxes reflected in the Tax Statements have been duly and promptly paid
during the last five years;

(d) The Tax Statements authentically and fully reflect facts concerning income,
assets, operations and the condition of any entity that must appear in them;

(e) There are no charges, accumulations and reserves for Taxes owed or
applicable but still not due concerning income, assets and operations of ISSUER,
as there is no obligation to pay for such taxes;

(f) There is no action, lawsuit, proceeding, audit or claim

                                     [STAMP]

                                        7

<PAGE>

underway, or to the best knowledge of SELLERS, there is no investigation
underway concerning income taxes, assets or operations of ISSUER;

(g) There are no agreements to extend the term to encumber Taxes on income,
assets or operations of ISSUER;

(h) All taxes of ISSUER have been paid or settled, and there, has not arisen any
situation derived from audits which, by applying similar principles, might
presume the possibility of a tax claim.

2. Intellectual Property: ISSUER holds no copyrights, patents, trademarks,
licenses or sublicenses of any of the above.

3. Accounts Receivable. Accounts receivable, reimbursable deposits, expenses
paid in advance, deferred charges, loans or advance payments granted by ISSUER
to any person are disclosed in Attachment "1".

4. Consents. No consents, approvals or authorizations by, nor statements,
entries or registrations with government or regulatory authorities for
execution, delivery and fulfillment of the AGREEMENT, or development of
operations

[STAMP]

                                       8

<PAGE>

contemplated therein are required, nor is consent by any person necessary to
carry out the operations contemplated herein, including but not limited to,
consent by third parties with whom credits, agreements, leases or other
contracts have been executed.

5. Observance of the Laws. ISSUER has all permits necessary to develop its
business as it currently does, all of which are now fully valid and in effect,
and ISSUER complies with the respective terms and conditions established in
them. ISSUER has complied with all applicable laws, bylaws, rules, regulations,
sentences, orders, briefs, "amparos" (private rights protection enforcement
remedy) and decrees, either of states or local, by government authorities or by
judicial or administrative authorities with competence over ISSUER, its
properties or assets.

6.Payment of Dividend. Since the moment when ISSUER was incorporated and until
the date of the AGREEMENT, there has not been any kind of payment of dividend in
favor of the shareholders of ISSUER.

7. Representations. The representations by SELLERS in this AGREEMENT, and
representations set forth in the documents mentioned (including but not limited
to financial statements,

[STAMP]

                                        9

<PAGE>

certifications or other briefs provided or that shall be provided by SELLERS or
ISSUER to BUYERS or to any of their representatives according to the provisions
hereof or in relation to the operations contemplated herein), do not contain nor
shall contain false representations, nor fail, nor shall fail to manifest facts
that are important and necessary according to the circumstances whereby they are
issued, and therefore, the representations set forth herein or in those are not
deceitful, and continue to be true per the date of this instrument.

FOURTH: RELEASE FROM LIABILITIES. SELLERS release BUYERS and ISSUER from any
claim, complaint, procedure, liability, obligation, damage or action filed after
signing the AGREEMENT, and originated from it due to facts, events or omissions
by SELLERS or ADMINISTRATORS, originated from the incorporation of ISSUER per
the date of the AGREEMENT, regardless of the amount.

For purposes of this Clause, BUYERS must notify SELLERS with respect to any such
claim, complaint, procedure, liability, obligation, damage or action referred to
in the preceding paragraph, within 30 (thirty) business days after BUYERS are
informed of any of such liabilities, except in case the term granted to ISSUER
as a consequence of any of such liabilities

                                     [STAMP]

                                       10

<PAGE>

is less than 30 (thirty) business days, in which case the notice to SELLERS
according to this paragraph shall be issued at least 24 (twenty-four) hours
before expiration of such term; in the understanding that failure to issue
notice according to this Clause shall release SELLERS of any liability in this
respect, including its obligations to indemnify according to this Agreement.

The provisions of the preceding paragraph shall not be applicable to any notice
issued directly to SELLERS.

FIFTH: INDEMNIFICATION BY SELLERS. Without prejudice of the provisions set for
in Clause Fourth above, in proportion to the SHARES which they hold according to
the representations of the AGREEMENT, SELLERS bind themselves to indemnify,
defend and hold ISSUER and BUYERS harmless of any claim, action, procedure,
liability, expense, attorney fees, including but not limited to, interest,
penalties and reasonable attorney fees (jointly, the "Damages") in which ISSUER
or BUYERS might incur derived for any of the following reasons:

(a) Any imprecision or falseness in the representations by BUYERS according to
the AGREEMENT and accounting matters registered in the accounting records of the
company;

                                     [STAMP]

                                       11

<PAGE>

(b) Noncompliance by SELLERS of any agreement, commitment or provision contained
in the AGREEMENT;

(c) Legal action, complaints, procedures, investigations, lawsuits or
settlements related to paragraphs (a) and (b) of this clause causing damage to
BUYERS or ISSUER.

(d) Not attend or untimely attend any of the contingencies indicated in Clause
Fourth above.

If any third party files or attempts any complaint or any other proceeding
against ISSUER or BUYERS, that may cause damages for which BUYERS or ISSUER have
the right to request payment of an indemnity from SELLERS in proportion to the
SHARES sold by each of them under the AGREEMENT, BUYERS must notify SELLERS at
the official address provided in Clause Eighth within 30 (thirty) business days
after being informed of the event that might originate such damages. Such notice
must include documents and information necessary for SELLERS to defend such
complaint, claim or proceeding before the competent authorities. For such end,
through ISSUER, BUYERS shall grant the necessary powers of attorney to the
person jointly indicated by SELLERS no later than the business day after they
receive the notice provided for in this paragraph,

                                     [STAMP]

                                       12

<PAGE>

in order to assume the corresponding defense. In case SELLERS do not provide
BUYERS and ISSUER the name of the professional in charge of the defense, BUYERS
may designate any professional to be in charge of the defense, in the
understanding that in such case, SELLERS shall be bound to pay for resulting
damages, as the case may be, which shall not exceed the amount established in
Clause Second of this Agreement. In case ISSUER does not, within the term
provided in this Clause, grant the powers of attorney to the professional
designated by SELLERS, SELLERS shall, as the case may be, be released from
having to pay the indemnification referred to in this Clause.

SIXTH: VALID TERM OF REPRESENTATIONS AND INDEMNIFICATIONS. The representations
made by SELLERS, as well as the indemnifications BUYERS and ISSUER have a right
to, as the case may be, as contained in the AGREEMENT, shall be in effect only
during five (5) years after the date when this AGREEMENT is signed.

SEVENTH: RESTORATION IN CASE OF DISPOSSESSION. SELLERS shall BE liable before
BUYERS for restoration in case of dispossession according to Article 2119 and
other related and applicable articles of the Federal Civil Code and correlated
articles of the other civil codes applicable in the states of

                                     [STAMP]

                                       13

<PAGE>

the Mexican Republic.

EIGHTH NOTICES: All notices, requests, instructions or any other communication
(jointly, the "Notices), which according to the AGREEMENT must be issued to the
other parties, shall be in writing, made at the official addresses provided
below:

BUYERS:
Ernesto Javier Gonzalez Castro
Bartolache No. 1810, Col. Del Valle C.P. 03100
Deleg. Benito Juarez, Mexico, D.F.

Mauricio Ramon Arevalo Mercado
Manuel Gutierrez Najera manzana 8 lote 49
Col. Filiberto Gomez, Chimalhuacan, Estado de Mexico
C.P. 56349

SELLERS:
Texas Oil & Chemical Co. II, Inc., and Nicholas N. Carter 7752 FM 418, Silsbe,
Texas 77656

Either one of the parties may change such official addressed by issuing written
notice to the other parties as provided in this Clause Eighth (in the
understanding that such change shall be valid once the notice is actually
received by the other parties).

All notices shall be considered received: (i) if received through personal
delivery; (ii) the moment when sending prior confirmation of receipt, when
transmitted by tax with electronic confirmation; and (iii) on the second
business day

                                     [STAMP]

                                       14

<PAGE>

after having been delivered to a recognized night delivery service (DHL or
FEDEX).

NINTH: OBLIGATIONS FOR BUYERS: BUYERS bind themselves to hold a Shareholders
Meeting of the ISSUER within 10 days after the date when this Agreement is
signed, to resolve on all of the following:

I.- Transfer of shares of the Corporation.

II.- Resignation by Nicholas N. Carter as member of the Board of Directors,
appointment of the new Board of Directors, as well as appointment of the
Statutory Auditor of the Corporation.

III.- Revocation and granting of powers of attorney.

IV.- Proposal, discussion and, as the case may be, approval to designate special
delegates for the Shareholders Meeting.

BUYERS bind themselves that within 15 (fifteen) business days after the date of
execution of this AGREEMENT they shall provide SELLERS a certified copy of the
public instrument legalizing the resolutions disclosed in this Clause.

TENTH: APPLICABLE LAWS. For construction, fulfillment and execution of the
AGREEMENT, the parties bind themselves to provisions of the Code of Commerce and
supplementary

                                     [STAMP]

                                       15

<PAGE>

ordinances.

ELEVENTH: CONTROVERSIES. For all matters regarding construction and/or
fulfillment of this AGREEMENT the parties expressly bind themselves to the
jurisdiction of the competent courts of the City of Mexico, Federal District,
and each of the parties hereby waives any other forum or jurisdiction that might
correspond to itself by reason of its current or any further official address.

TWELFTH: INTEGRAL AGREEMENT. The parties recognize this AGREEMENT as the coming
of minds between themselves. All previous communications, promises and
agreements are considered revoked, ended and substituted by the content of this
AGREEMENT.

THIRTEENTH: ASSIGNMENT. Rights and obligations derived from the AGREEMENT may
not be assigned, nor in any other manner conveyed without prior written consent
by the other parties.

FOURTEENTH: TAXES. Regarding the obligation for BUYERS to withhold against the
individual seller, NICHOLAS N. CARTER, 20% the price of the operation as
provisional payment of Federal Income Tax, according to paragraph four of
Article 154 of the Federal Income Tax Law, such withholding is

                                     [STAMP]

                                       16

<PAGE>

applied and shall be filed before the corresponding revenue office. In relation
to selling corporation, TEXAS OIL & CHEMICAL CO. II, INC., which files taxes
according to Title II of the Federal Income Tax Law and proves its corresponding
registration, does not have to apply BUYERS any withholding, and therefore, must
accumulate and file the total corresponding income during the year when
transferred.

FIFTEENTH: MODIFICATIONS. The AGREEMENT may not be modified except through
written consent by the parties.

SIXTEENTH: NO FAULTS. The parties declare they are aware of the value and legal
scope of this AGREEMENT, and therefore manifest they have granted each other the
opportunity to explain and clarify the content of its clauses to each other.
They also acknowledge that what has been agreed results from their free and
spontaneous disposition, and therefore, there is not violence, error or any
situation that might invalidate their consent.

SEVENTEENTH: VALIDITY AND EFFICACY. The AGREEMENT shall be valid and have full
legal effect between the parties when signed by all the SELLERS and the BUYERS.

EIGHTEENTH: COPIES. The AGREEMENT shall be signed in 3

                                     [STAMP]

                                       17

<PAGE>

(three) copies, each considered an original, to be distributed among the
appearing parties and for control by the ISSUER.

Having been fully read and manifested their express consent to it, the parties
sign this AGREEMENT in the City of Mexico, Federal District, on June 9, 2005.

                                     SELLERS

(illegible signature)                             (illegible signature)
----------------------------                      ---------------------
Texas Oil & Chemical Co. II,                      Nicholas N. Carter
Inc., represented by
Nicholas N. Carter

                                     BUYERS

(illegible signature)                             (illegible signature)
----------------------------                      ------------------------------
Ernesto Javier Gonzalez                           Mauricio Ramon Arevalo
Castro                                            Mercado

                                    WITNESSES

(illegible signature)                             (illegible signature)
----------------------------                      ------------------------------
Name: Leopoldo Escobar L.                         Name: Gerardo Maldonado

                                     [STAMP]

                                       18

<PAGE>

The undersigned, Kristin Dagny O'Hea de Langarica, Litorales 69, Col. Las
Aguilas, Mexico, D.F., 5593-0471, who have been authorized by the Federal
Judiciary Council (Consejo de la Judicatura Federal) to act as an expert
translator before all courts belonging to the Judicial Branch of the Federal
Government of Mexico, certify that the foregoing is a true and exact translation
of the attached document.

Mexico, D.F., June 21, 2005.

/s/ Kristin Dagny O'Hea de Langarica
------------------------------------
    Kristin Dagny O'Hea de Langarica

<PAGE>

                                 ATTACHMENT "I"

                              Accounts Receivable

                                     [STAMP]

<PAGE>

                  LIST OF ACCOUNTS RECEIVABLE PER MAY 31, 2005

<TABLE>
<CAPTION>
                                                 A.P.
<S>                                              <C>             <C>        <C>
PRODUCTOS QUIMICOS GUTIERREZ, S.A. DE C.V.       $742,894.54     $10.8699   $68,436,19
GRUPO PETROPOL, S.A. DE C.V.                                                $15,343.87
                                                                            ----------
                                                                            $83,780.06
</TABLE>

                                     [STAMP]

<PAGE>

The undersigned, Kristin Dagny O'Hea de Langarica, Litorales 69, Col. Las
Aguilas, Mexico, D.F., 5593-0471, who have been authorized by the Federal
Judiciary Council (Consejo de la Judicatura Federal) to act as an expert
translator before all courts belonging to the Judicial Branch of the Federal
Government of Mexico, certify that the foregoing is a true and exact translation
of the attached document.

Mexico, D.F., June 21, 2005.

/s/ Kristin Dagny O'Hea de Langarica
------------------------------------
    Kristin Dagny O'Hea de Langarica

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