O=C(c1ccccc1)[C@@H]1[C@@H](C(=O)c2ccc(F)cc2)[C@@]2(C(=O)Nc3ccccc32)[C@H]2c3ccccc3C=CN12
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?