4-METHYL-3-(METHYL-7H-PYRROLO(2,3-D)PYRIMIDIN-4-YLAMINO)-.BETA.-OXO-1-PIPERIDINEPROPANOIC ACID, (3R,4R)-
4-methyl-3-(methyl-7h-pyrrolo(2,3-d)pyrimidin-4-ylamino)-.beta.-oxo-1-piperidinepropanoic acid, (3r,4r)-