C[C@@H](CO)N1C[C@@H](C)[C@@H](CN(C)C(=O)c2ccc(F)cc2)Oc2cc(-c3cccc(C#N)c3)ccc2S1(=O)=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?