CC1Cc2cc(C(=O)C3=C(O)C(=O)N(CCN4CCOCC4)C3c3ccc([N+](=O)[O-])cc3)ccc2O1
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?