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