O=C(O)[C@H]1CCCN1C(=O)c1ccccc1N1C(=O)[C@@H]2Cc3c([nH]c4ccccc34)C(c3cccc(Cl)c3)N2C1=O
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?