CC(=O)O[C@H]1CC[C@@]2(C)[C@@H](CC[C@@H]3[C@@H]2CC(=O)[C@]2(C)[C@H]4C(=O)C=C(C)C[C@H]4C[C@@H]32)C1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?