CCC(C)c1ccccc1N1CC(C(=O)N2CCN(S(=O)(=O)c3cccc([N+](=O)[O-])c3)CC2)CC1=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?