CCOC(=O)C1=C[C@@H](CC)N(S(=O)(=O)c2ccc([N+](=O)[O-])cc2)[C@H]1c1ccccc1
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?