C[C@@H]1C(=O)N(S(=O)(=O)c2ccccc2[N+](=O)[O-])[C@H]1c1ccc(-c2ccccc2)cc1
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?