O=C1[C@H]2[C@@H](C(=O)N1C1CCCCC1)[C@@H](c1ccc(F)cc1)N1C(=O)N(c3cccc(Cl)c3)C(=O)[C@@]21Cc1ccc(Cl)cc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?