O=C(OC(c1ccccc1)c1ccccc1)[C@@H]1[C@@H]2C(=O)N(c3ccccc3F)C(=O)[C@@H]2[C@H]2C=Cc3ccccc3N12
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?