CCC1=C2CC[C@H]3C(=O)N(CC)C(=O)[C@H]3[C@H]2[C@@]2(C)C(=O)N(CC(=O)OC)C(=O)N2C1=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?