C=C(CO)[C@H]1Cc2c(ccc3c2O[C@H]2COc4cc(OC)c(OC)cc4[C@@H]2C3=O)O1
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?