CC1(C)C(=O)CC[C@]2(C)C3=C(CC[C@@H]12)C[C@]1(C)CC[C@H]2C(C)(C)C(=O)CC[C@]2(C)[C@H]1CC3
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?