CC(=O)O[C@@H]1[C@@]2(C)[C@@H]3CC(C)(C)C(=O)[C@]3(OC(C)=O)C[C@@]2(C)[C@H](OC(C)=O)[C@H]2[C@@H](OC(=O)c3ccccc3)[C@@H](C)C[C@@]21O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?