COc1ccc(NC(=O)Nc2ccc3c(c2)CC(=O)N([C@H](C)CO)C[C@H](C)[C@H](CN(C)Cc2ccc(C(=O)O)cc2)O3)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?