If this letter correctly states the agreement and understanding we have reached, please indicate your acceptance by countersigning the enclosed copy and returning it to me by the 45th day of receipt, or within three days after the Termination Date, which is later. You may not sign the Agreement before the Termination Date. You may revoke this Agreement for a period of seven (7) days after signing it. In order to revoke the Agreement, you must submit a written notice of revocation to Seth Tasker located at seth.tasker@infi.com. This written notice may be sent by mail, overnight mail, email or hand-delivery but must be received by no later than the close of business on the seventh day. The Agreement will not become effective or enforceable, and no payments will be made, until this revocation period has expired (“Effective Date”) without being exercised.