COc1ccc(C(=O)c2c(C(C(=O)c3ccc(OC)cc3)C(=O)c3ccc(OC)cc3)n(C(=O)c3ccc(OC)cc3)c3ccccc23)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?