CCOc1ccc(NC(=O)C(=O)CC(=O)c2c[n+]([O-])c3cc(C)c(C)cc3[n+]2[O-])cc1
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?