COC(=O)C[C@H]1[C@]2(C)C3=C(C)[C@H](c4ccoc4)CC3O[C@@H]2[C@@H]2OC(=O)[C@]3(C)CCC(=O)[C@@]1(C)[C@@H]23
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?