O=C1NC[C@H](c2ccccc2)OC(=O)[C@@H](Cc2ccc(F)cc2)C/C=C\C[C@H]1CC(=O)N(CCO)Cc1ccccc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?