5817-96-9: 5,7-dihydro-6H-pyrrolo [2,3-d] pyrimidin-6-one impurity

It is one of impurity present in Tofacitinib, Tofacitinib is an inhibitor of Janus kinases is a group of intracellular enzymes involved in signaling pathways that affect hematopoiesis and immune cell function, prevent the body from responding to cytokine signals. Tofacitinib is a partial and reversible Janus kinase inhibitor that prevents the body from responding to cytokine signals. which use is associated with a rapid decrease in C-reactive protein dose-dependent decreases in natural killer cells, and dose-dependent increases in B cells.