C[C@H]1CN([C@@H](C)CO)C(=O)Cc2cc(NC(=O)C3CC3)ccc2O[C@H]1CN(C)Cc1ccc(Oc2ccccc2)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?