O=C(Nc1ccc(Cl)cc1Cl)C1C(=O)N(c2ccc(Cl)cc2Cl)C(=O)/C1=N\Nc1ccc([N+](=O)[O-])cc1[N+](=O)[O-]
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?