C[C@@H](CO)N1C[C@@H](C)[C@H](CN(C)C(=O)[C@H](C)c2ccccc2)OCc2ccccc2-c2c(n(C)c3ccccc23)C1=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?