CCC1(CC)C(=O)C2=C3C1[C@H](C(=O)OC)CC(C(=O)OC)C[C@H]3n1c(=O)n(-c3ccccc3)c(=O)n1[C@H]2C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?