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![(6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-methyl-(4-methyl-piperidin-3-yl)-amine (tofacitinib impurity E)](/upload/image/thumb/2_600_600_20250318202503181048.jpg)
(R)-dihydro-4-propyl-2(3H)-furanone
