2-{2-[5-(4-Methyl-piperazin-1-yl)-2-trifluoromethoxy-phenylamino]-pyrimidin-4-yl}-4-oxo-1-(2,2,2-trifluoro-ethyl)-1,4,6,7-tetrahydro-pyrrolo[3,2-c]pyridine-5-carboxylic acid tert-butyl ester