CC1CCC2C(=O)N3C(CCC(C)C3c3ccc(-c4ccco4)cc3)C(=O)N2C1c1ccc(-c2ccco2)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?