CC(=O)Oc1cc(-c2oc3cc(OC(C)=O)c(C4OC(CO)C(O)C(O)C4O)c(OC(C)=O)c3c(=O)c2O)c(OC(C)=O)cc1O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?