A specific crystalline mesylate salt form of (3S)-Tetrahydrofuran-3-yl (4S)-4-isopropyl-1,4,6,7-tetrahydro-5H-imidazo[4,5-c]pyridine-5 -carboxylate, and the use of the same in medicine. (Formula (I)).Una forma de sal de mesilato cristalino específica de (4S)-4-isopropil-1,4,6,7-tetrahidro-5H-imidazo [4,5-c]piridin-5-carboxilato de (3S)-tetrahidrofuran-3-ilo, y el uso de la misma en medicina. (Fórmula (I)). (ver Fórmula).