O=c1cc(-c2ccccc2)oc2cc(O[C@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]3O)c(O)c(O)c12
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?