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![Ethyl 3-{4-methyl-3-[methyl-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-amino]-piperidin-1-yl]-3-oxopropanoate (Tofacitinib impurity K)](/upload/image/thumb/2_600_600_20250318202503181048.jpg)
![2-[1-(4-Chlorophenyl)-propenyl]-pyridine (impurity U)](/upload/image/thumb/1_300_300_20250318202503181048.jpg)
2-[1-(4-Chlorophenyl)-propenyl]-pyridine (impurity U)
