COC(=O)C(=O)C(/C(=N/N)C(=O)Nc1ccccc1C(N)=O)c1nc2ccc([N+](=O)[O-])cc2nc1O
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?