Exhibit 10.11 RIGEL PHARMACEUTICALS 24 WINDSOR DRIVE, HILLSBOROUGH. CA 94010 PHONE/FAX: 415-579-4638 January 16, 1997 Dr. Donald G. Payan 24 Windsor Drive Hillsborough, CA 94010 RE: EMPLOYMENT AGREEMENT Dear Don: Rigel Pharmaceuticals, Inc. (the "Company") is pleased to offer you the position of Vice President Research and Chief Operating Officer of the Company beginning January 16, 1997 ("Effective Date") on the terms set forth below (the "Agreement"). As Vice President Research and COO, you will perform the duties customarily associated with this position, and such duties as may be assigned to you by the Company's President and CEO. Of course, the Company may change your position, duties and work location from time to time, as it deems necessary. Your annual salary will be $185,000 ("Base Salary"), less standard deductions and withholdings, paid semi-monthly. You will be expected to work as required to complete your job duties. In addition, upon formal approval by the Board, the Company will issue to you 750,000 shares of Company founders common stock as described in the Company's Stock Purchase Agreement (the "Founders Stock"). This Founders Stock will be subject to the repuchase provisions contained in the Stock Purchase Agreement (the "Purchase Option"). If your employment with the Company is terminated without cause within three years, then the Founders Stock which remains subject to the Purchase Option will immediately lapse according to the following: (i) in the event at least one-third (1/3) of the Founders Stock remains subject to the Purchase Option, then the Purchase Option shall lapse with respect to one-third (1/3) of the Founders Stock; or (ii) in the event less than one-third (1/3) of the Founders Stock remains subject to the Purchase Option, then the Purchase Option shall lapse with respect to all such Founders Stock. In addition to your salary and equity compensation, on the Effective Date the Company will provide you with sick and vacation leave, medical and dental insurance coverage, and any other benefits consistent with Company policy for exempt, full-time employees. Details about these benefits are available for your review. The Company reserves the right to modify your compensation and benefits from time to time, as it deems necessary. Dr. Donald G. Payan January 16, 1997 Page 2 The Company agrees to reimburse you for reasonable documented business expenses pursuant to Company policy. You will be expected to abide by all of the Company's policies and procedures. As a condition of your employment, you also agree to sign and comply with the Company's Proprietary Information and Inventions Agreement (attached hereto as Exhibit A). By accepting this offer, you represent and warrant that you are not a parry to any agreement with any third party or prior employer which would conflict with or inhibit your performance of your duties with the Company. Either you or the Company may terminate your employment relationship at any time for any reason whatsoever, with or without cause or advance notice. This at-will employment relationship cannot be changed except in a writing signed by a duly authorized officer of the Company. If the Company terminates your employment without cause, the Company will make severance payments to you in the form of continuation of your base salary in effect on the Effective Date for one (1) year following your separation from the Company. These payments will be made on the Company's ordinary payroll dates, and will be subject to standard payroll deductions and withholdings. In the event of such termination, you will not be entitled to any additional compensation or benefits beyond what is provided in this paragraph and in the paragraph above relating to acceleration of Founders Stock vesting. If you resign or your employment is terminated for cause, all compensation and be