COc1ccc2c(c1)OC(c1ccc3c(c1)OCO3)C(OC(=O)Nc1cc(OC)c(OC)c(OC)c1)C2=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?