O=C(N/C(=C/c1ccc(Cl)cc1)c1nc2ccccc2c(=O)n1Nc1ccc([N+](=O)[O-])cc1[N+](=O)[O-])c1ccccc1
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?