.BETA.-CYCLOPENTYL-4-(7-((2-(TRIMETHYLSILYL)ETHOXY)METHYL)-7H-PYRROLO(2,3-D)PYRIMIDIN-4-YL)-1H-PYRAZOLE-1-PROPANENITRILE (+)-DIBENZOYLTARTARIC ACID, (.BETA.S)-
.beta.-cyclopentyl-4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7h-pyrrolo(2,3-d)pyrimidin-4-yl)-1h-pyrazole-1-propanenitrile (+)-dibenzoyltartaric acid, (.beta.s)-