COP(=O)(OC)C(=O)N1N(c2ccc([N+](=O)[O-])cc2)C(=O)C(C)NC1(NNc1ccc([N+](=O)[O-])cc1)P(=O)(OC)OC
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?