CCN(CC)C(=O)[C@H]1C[C@H](CC(=O)NCc2ccco2)C(=O)N2CCc3c([nH]c4cc(CCC(=O)N(C)C)ccc34)[C@]12C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?