COC(=O)c1cc2cc3c(c(O)c2c(=O)o1)O[C@@]1(Oc2c(O)c4c(c(O)c2[C@H]1OC1CC(OC)C(O)C(C)O1)C(=O)C=C(OC)C4=O)[C@H](O)C3
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?