O=C1C2N=NN(CC(=O)N3N=C(c4ccccc4)CC3c3ccc([N+](=O)[O-])cc3)C2C(=O)N1c1ccccc1
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?