| 1. | In connection with your consideration of a possible negotiated business combination transaction between Theseus Pharmaceuticals, Inc. (the “Company”) and Concentra Biosciences, LLC (Concentra Biosciences, LLC and Tang Capital Parnters, LP and/or one or more of your affiliates, collectively referred to herein as “you”) (the “Possible Transaction”), you have requested information concerning the Company that is confidential and proprietary. As a condition to your being furnished such information, you agree to treat any information, in any form or medium, whether written or oral, relating to the Company or any of its subsidiaries, affiliates or divisions (whether prepared by the Company, its advisors or otherwise) that is furnished to you before, on or after the date of this letter agreement, by or on behalf of the Company (herein collectively referred to as the “Evaluation Material”) in accordance with the provisions of this letter agreement and to take or abstain from taking certain other actions herein set forth. The term “Evaluation Material” includes, without limitation, all notes, analyses, compilations, spread sheets, data, reports, studies, interpretations or other documents furnished to you or your Representatives (as defined below) or prepared by you or your Representatives to the extent such materials reflect or are based upon, in whole or in part, the Evaluation Material. The term “Evaluation Material” does not include information that (a) is or becomes available to you on a nonconfidential basis from a source other than the Company or its Representatives; provided that such source is not known by you to be bound by a confidentiality agreement with, or other contractual, legal or fiduciary obligation to, the Company that prohibits such disclosure, (b) is or becomes generally available to the public other than as a result of a disclosure by you or your Representatives in violation of this letter agreement, or (c) has been or is independently developed by you or your Representatives without the use of the Evaluation Material or in violation of the terms of this letter agreement. For purposes of this letter agreement, the term “Representatives” shall include (i) when used in relation to the Company, the Company’s subsidiaries and Affiliates (as such term is defined in Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) and its and their respective directors, officers, consultants, employees, attorneys, accountants, financial advisors and other professional representatives, and (ii) when used in relation to you, your subsidiaries and Affiliates and your and their respective directors, officers, employees, attorneys, accountants, financial advisors and other professional representatives. You hereby agree that the Evaluation Material will be kept confidential and used solely for the purpose of evaluating and negotiating the Possible Transaction; provided, however, that the Evaluation Material may be disclosed (i) to your Representatives who need to know such information for the sole purpose of evaluating and negotiating a Possible Transaction, (ii) pursuant to an External Demand in accordance with paragraph 4 of this letter agreement, and (iii) as the Company may otherwise consent in writing. All such Representatives shall (A) be informed by you of the confidential nature of the Evaluation Material, (B) agree to keep the Evaluation Material strictly confidential, and (C) be advised of the terms of this letter agreement and agree to be bound by the terms hereof to the same extent as if they were parties to this letter agreement. You agree to be responsible for any breaches of any of the provisions of this letter agreement by any of your Representatives (it being understood that such responsibility shall be in addition to and not by way of limitation of any right or remedy the Company may have against your Representatives with respect to such breach). It is understood and agreed that the Company may, in its sole discretion, from time to time determine that disclosure of certain Evaluation Material to certain of your Representatives may be inappropriate, in which event at the Company’s request, you shall refrain from disclosing such Evaluation Material to such Representatives. |