O=C1/C(=C/c2cccc([N+](=O)[O-])c2)N=C(c2ccccc2)N1c1nc2c(Cl)cc(Cl)cc2s1
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?