O=C(OC1CO[C@H]2O[C@@H]1[C@H](OC(=O)c1ccccc1)[C@H]2OC(=O)c1ccccc1)c1ccccc1
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?