Cc1n(CC(=O)c2ccc([N+](=O)[O-])cc2)c2c([n+]1CC(C)C)C(=O)c1ccccc1C2=O.[Br-]
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?