CC[C@H]1CC2CN3CCc4c([nH]c5c([C@H]6C[C@H]7[C@H](CC)CN(C)[C@@H](Cc8c6[nH]c6ccccc86)[C@H]7C(=O)OC)c(OC)ccc45)C(C(=O)OC)(C2)C13
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?