4H-Pyrrolo[2,3-d]pyriMidin-4-one, 3,7-dihydro-2-[[3-(4-Methyl-1-piperazinyl)phenyl]aMino]-

3,7-Dihydro-2-[[3-(4-methyl-1-piperazinyl)phenyl]amino]-4H-pyrrolo[2,3-d]pyrimidin-4-one is a reactant used in the preparation of pyrrolopyrimidine compounds as janus kinase inhibitors with potential uses in the treatment of cancer.