definiens: ( as defined below ) and subject to Biolding 's verification to its reasonable satisfaction that the Milestone has been achieved, Biolding agrees to purchase $ 15,000,000 worth of additional shares of the Company 's Common Stock in the Follow - On Investment . The Company shall provide to Biolding at the time of the written notice of the completion of the Milestone written evidence of the completion of the Milestone and Biolding shall have the right to examine and verify such evidence, including with input from outside advisors who are approved by the Company which approval shall not be unreasonably withheld and who agree to be bound by the confidentiality obligations contained in Section 12 hereof . If Biolding is not in agreement with the completion of the Milestone, Biolding shall not be obligated to purchase such additional shares of the Company 's Common Stock in the Follow - On Investment . In such a case, Biolding and the Company can mutually decide to extend the date of completion of the Milestone