O=C(Cc1ccc([N+](=O)[O-])c([N+](=O)[O-])c1CC(=O)C(=O)Nc1cc(Cl)ccc1Cl)C(=O)Nc1cc(Cl)ccc1Cl
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?