CC(C)(C)OC(=O)NC(Cc1ccc(O)cc1)C(=O)NC(CCCCN)C(=O)NC(Cc1ccc(O)cc1)C(=O)NC(CCCCN)C(=O)ON1C(=O)CCC1=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?