CCCCCCCCOC(=O)C12Oc3ccc(-c4ccc5c(c4O)C(=O)C4=C(O)CC(C)C(O)C4(C(=O)OCCCCCCCC)O5)c(O)c3C(=O)C1=C(O)CC(C)C2O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?