C=CC1=C2C=C(C3CC3)N(c3ccc(OC)cc3)C=C2C(=O)C(C)(OC(=O)c2ccco2)C1=O
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?