COc1cc([C@@H]2c3cc4c(cc3[C@@H](NC(=O)c3cccc(N)c3)C3COC(=O)[C@@H]32)OCO4)cc(OC)c1O
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?