O=C1[C@@H]2Cc3c([nH]c4ccccc34)C(c3cccc([N+](=O)[O-])c3)N2C(=O)CN1C1CCN(Cc2ccccc2)CC1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?