1-Piperidinepentanenitrile, β-imino-4-methyl-α-[[(3R,4R)-4-methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-1-piperidinyl]carbonyl]-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-δ-oxo-, (3R,4R)- [ 2102040-00-4 ]