CC1CC(C)CN(S(=O)(=O)c2cc(Cl)c(Oc3ccc([N+](=O)[O-])cc3Cl)c(Cl)c2)C1
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?