CC(C)N(C(=O)[C@H]1C[C@H](CC(=O)NCCC2=CCCCC2)C(=O)N2CCc3c([nH]c4cc(-c5ccco5)ccc34)[C@]12C)C(C)C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?