COc1cc(OC2OC(CO)C(O)C(O)C2O)c2c(c1)O[C@@H]1[C@H](O)Oc3cc(OC)c(OC)cc3[C@]1(O)C2=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?