The present invention relates to novel pyrrolo[3,2-c]pyridine-6-amino derivatives that inhibit the spindle checkpoint function of Monospindle 1 (Mps1 – also known as TTK) kinases. In particular, the present invention relates to isopropyl 6-(2-methoxy-4-(1-5 methyl-1H-1,2,3-triazol-5-yl)phenylamino)-2-(1-methyl-1H-pyrazol-4-yl)-1H-pyrrolo[3,2- c]pyridine-1-carboxylate and isopropyl 6-(2-methoxy-4-(1-methyl-1H-tetrazol-5- yl)phenylamino)-2-(1-methyl-1H-pyrazol-4-yl)-1H-pyrrolo[3,2-c]pyridine-1-carboxylate and their use as therapeutic agents for the treatment and/or prevention of proliferative diseases, such as cancer. The present invention also relates to processes for the 10 preparation of these compounds and to pharmaceutical compositions comprising them.
