CN(C(=O)c1ccc(NC(=O)Cc2ccc(NC(=O)C3CCCN(S(=O)(=O)c4cccc([N+](=O)[O-])c4)C3)cc2)cc1)C1CCCC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?