O=C(NC(Cc1ccccc1)C(=O)O)/C(=C/c1ccc([N+](=O)[O-])cc1)NC(=O)c1ccccc1Br
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?