CN(C)CCOc1ccc2c(c1)C(=O)C(=Cc1ncc([N+](=O)[O-])n1C)C2.O=S(=O)(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?