system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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[ * ] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. CONFIDENTIAL EXECUTION VERSION LICENSE, DEVELOPMENT AND COMMERCIALIZATION AGREEMENT THIS LICENSE, DEVELOPMENT AND COMMERCIALIZATION AGREEMENT (this "Agreement") dated as of May 31, 2017 (the "Effective Date"), is made and entered into by and between Array BioPharma Inc., a company organized under the laws of Delaware and having its principal place of business at 3200 Walnut Street, Boulder, CO 80301 USA, ("Array") and Ono Pharmaceutical Co., Ltd., a company duly organized and existing under the laws of Japan, having offices and principal place of business at 8-2, Kyutaromachi 1-chome, Chuo-ku, Osaka 541-8564, Japan ("Ono"). BACKGROUND A. Array now owns or controls certain patents, know-how and other intellectual property relating to the Products (as defined below); B. Ono has experience in developing, marketing and distributing pharmaceutical products; C. Array and Ono wish to collaborate on the further development, manufacture and commercialization of the Products, with Ono taking the lead role in such efforts in the Ono Territory (as defined below); and D. Array is willing to grant to Ono, and Ono desires to obtain, certain exclusive rights and licenses with respect to the manufacture, registration and commercialization of the Products in the Ono Territory. Array will retain the right to develop and commercialize the Products for the Array Territory, all on the terms and conditions set forth herein. NOW, THEREFORE, in consideration of the foregoing premises and the mutual covenants herein contained, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows: ARTICLE I DEFINITIONS 1.1 "Affiliate" of a Party means any person, corporation or other entity that, directly or indirectly, controls, is controlled by, or is under common control with such Party, as the case may be. As used in this Section 1.1, the word "control" (including, with correlative meaning, the terms "controlled by" or "under the common control with") shall mean the actual power, either directly or indirectly through one or more intermediaries, to direct or cause the direction of the management and policies of such entity, whether by the ownership of more than fifty percent (50%) of the voting share capital in such person, corporation, or other entity, or by contract or otherwise. 1.2 "Annual Net Sales" means the Net Sales generated over any given Fiscal Year, or in the case of the Fiscal Year in which the First Commercial Sale of the first Product occurs, the Net Sales generated during the period commencing on the date of such First Commercial Sale and continuing until the end of such Fiscal Year. [ * ] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. 1.3 "Applicable Regulatory Exclusivity Period" means with respect to a particular Product and particular country in the Ono Territory, the period commencing upon the receipt of the first grant of Regulatory Exclusivity in such country for such Product ("Initial Regulatory Exclusivity"), and continuing until the later of (i) the expiration of such Initial Regulatory Exclusivity, or (ii) if any subsequent grant of Regulatory Exclusivity is received prior the expiration of the Initial Regulatory Exclusivity, then until the expiration of such additional Regulatory Exclusivity if such expiration would occur after the expiration of the Initial Regulatory Exclusivity. 1.4 "Array Know-How" means, subject to Section 4.4(c)(ii), all scientific, medical, technical, manufacturing, marketing, regulatory, market access and other information (including clinical data and other related information generated in compliance with CDISC standards) relating to Binimetinib, Encorafinib, a Product and/or any Companion Diagnostic useful with respect to the Development, Manufacturing, registration (including registration for MAA) or Commercialization of a Product (including the Data), to the extent Controlled by Array or its Controlled Affiliates as of the Effective Date or during the term of this Agreement, and needed by or reasonably useful to Ono in order for Ono to exercise its rights or perform its obligations under this Agreement. Notwithstanding the foregoing or Section 1.18 (Data) below, but subject to Section 2.4 (Future Third Party Partners), Array Know-How shall in any case include all such items that are generated by or under authority of Array, or any of its Affiliates, in connection with Development
"""

Extract the exact clause related to "Effective Date" from the excerpt above.

assistant: May 31, 2017