CN1C2=CC=CC=CC2=[N+](C)C12C([N+](=O)[O-])=CC(=[N+]([O-])[O-])C=C2[N+](=O)[O-]
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?