CC(=O)NNc1nc(C)c(C(=O)NNC(=O)C(=O)Nc2c([N+](=O)[O-])ccc(C)c2C)s1
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?