 What is the name of the agreement that Parent is not a party to?
The Parent Stockholder hereby agrees not to commence or participate in, and to take all actions necessary to opt out of any class in any class action with respect to, any claim, derivative or otherwise, against the Company, Parent or any of their respective Subsidiaries or successors (a) challenging the validity of, or seeking to enjoin or delay the operation of, any provision of this Agreement or the Merger Agreement (including any claim seeking to enjoin or delay the Closing) or (b)  except in the case of gross negligence or willful misconduct, alleging a breach of any duty of the Company Board or Parent Board in connection with the Merger Agreement, this Agreement or the transactions contemplated thereby or hereby.
the Merger Agreement