O=[N+]([O-])c1ccc(/C=N/n2c(S)nnc2CCc2nnc(S)n2/N=C/c2ccc([N+](=O)[O-])o2)o1
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?