definiens: ( as that term is defined in the Pfizer Agreement ) of the Pfizer Agreement ( the ) once it has occurred, as promptly as reasonably possible .. Paragraphs 3 through 11 of this Letter Agreement shall become effective as of, and only upon the occurrence of the Effective Date . Except as otherwise expressly provided herein, the provisions of this Letter Agreement shall be effective from the date of this Letter Agreement written above . If [COMPANY] and Pfizer have not fully executed the Pfizer Agreement on or before 180 days following the date hereof, or the Pfizer Agreement is terminated prior to the Effective Date, [COMPANY] will promptly notify TJU, and thereafter TJU or [COMPANY] may terminate this Letter Agreement upon written notice to the other party . Subject to [COMPANY] 's compliance with the terms of this Paragraph 2, TJU confirms that [COMPANY] has satisfied its obligations under Sections 3.1 and 3.2(f ) of the TJU Agreement to provide TJU with a copy of the Pfizer Agreement and that this Letter Agreement constitutes notice that Pfizer is not a as provided in Sections 5.6 and 7.3 ofthe TJU Agreement