C[C@@H]1O[C@@H](O[C@@H]2[C@@H](CO)O[C@@H](Oc3c(-c4ccc(O)cc4)oc4cc(O)cc(O)c4c3=O)[C@H](O)[C@H]2O)[C@H](O)[C@H](O)[C@H]1O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?