COc1ccc(S(=O)(=O)N(C)[C@H]2C[C@H]3c4cc(-c5ccccc5)ccc4CCN3C(=O)[C@H]2[C@H](C)O)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?