C[C@H]1CCCCO[C@@H](CN(C)C(=O)c2ccccc2)[C@H](C)CN([C@@H](C)CO)C(=O)c2cc(NC(=O)Nc3cccc4ccccc34)ccc2O1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?