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:
"""
shares of Common Stock constitute all of the Common Stock beneficially owned by the White Hat Parties and the White Hat Parties have no agreements, understandings or undertakings with any third party to share or delegate disposition or voting control over such shares of Common Stock, or to transfer, hypothecate or lend such shares Common Stock. (b) Each of the White Hat Parties has the power and authority to execute and deliver this Agreement. This Agreement (i) has been duly and validly authorized by each of the White Hat Parties, and constitutes a legal, valid and binding obligation of each of the White Hat Parties, enforceable against each of the White Hat Parties in accordance with its terms except as may be limited by bankruptcy, insolvency or similar laws affecting creditors' rights and general equitable principles, (ii) does not require the approval of any investor in or member of the White Hat Parties and (iii) does not violate any law, order of any court or any governmental agency or regulation or the charter or any organizational document Exhibit 10.1 of the White Hat Parties, or conflict with, result in a breach of or constitute a default under any agreement or instrument by which the White Hat Parties or any of their respective assets is bound. 3. Representations of the Company. The Company represents and warrants to the White Hat Parties as of the date hereof that it has the corporate power and authority to execute and deliver this Agreement. This Agreement (i) has been duly and validly authorized by the Company and constitutes a legal, valid and binding obligations of the Company, enforceable against the Company in accordance with its terms except as may be limited by bankruptcy, insolvency or similar laws affecting creditors' rights and general equitable principles and (ii) does not violate any law, order of any court or any agency or regulation or the Company's Certificate of Incorporation or the Bylaws, or conflict with, result in a breach of or constitute a default under any agreement or instrument by which the Company or any of its assets or the assets of its subsidiaries are bound. 4. Voting Commitments. The White Hat Parties shall appear in person or by proxy for quorum purposes at the 2020 Annual Meeting, including any adjournment or postponement thereof, to vote all of the shares of Common Stock beneficially owned by the White Hat Parties on the record date (if the 2020 Annual Meeting is within thirty (30) days of the anniversary of the Company's 2019 Annual Meeting of Stockholders, such number of shares shall be no less than 90% of the Current Position) for such meeting (i) in favor of all persons nominated by the Board to serve as directors of the Company and against any stockholder nominated candidate not endorsed by the Board, (ii) against the stockholder proposal made pursuant to Rule 14a-8 under the Exchange Act as disclosed to the White Hat Parties prior to the execution of this Agreement, (iii) to ratify the appointment of the Company's independent registered public accounting firm, and (iv) in accordance with the Board's recommendation with respect to the Company's "say-on-pay" proposal and new equity compensation plan (collectively, the "2020 Proposals"), provided, that with respect to the proposals described in clauses (ii) through (iv) of this Section 4, the White Hat Parties may vote in accordance with the recommendation of Institutional Shareholders Services to the extent such recommendation differs from the voting commitments set forth herein and provided that the White Hat Parties do not publicly disclose their vote on such proposals if it differs from the Board's recommendation; and provided, further, that White Hat Parties shall have the right to vote the shares of Common Stock beneficially owned by the White Hat Parties in their sole discretion with respect to all other proposals brought before the 2020 Annual Meeting. The White Hat Parties shall provide written evidence of the votes made in accordance with the foregoing sentence to the Company no later than ten business days before the 2020 Annual Meeting. 5. Support Period Covenants. Except as otherwise contemplated in this Agreement, at all times during the period commencing on the date hereof and ending on the date that is thirty (30) days prior to expiration of the advance notice period for the submission by stockholders of director nominations for consideration at the 2021 Annual Meeting as set forth in the Bylaws, the White Hat Parties shall not, and shall cause the White
"""

Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.