Smiles Code
C[C@@H]1CCN(C[C@H]1N(C)c2ncnc3[nH]ccc23)C(=O)CC#N
(3S,4R)-Tofacitinib is an enantiopure stereoisomer of the drug, Janus kinase 3(Jak3) inhibitor (CP-690,550) that has been found to inhibit selected members of the STE7 and STE20 subfamily of kinases.