- 28 -Novel polymorphic forms of methyl {4,6-diamino-2-[1-(2-fluorobenzy1)-1H-pyrazolo [3,4- blpyridin-3-yllpyrimidin- 5-ylIcarbamate AbstractThe invention relates to novel forms of methyl (4,6-diamino-241-(2-fluorobenzy1)-111-5 pyrazolo[3,4-b]pyridin-3-yl]pyrimidin-5-yllcarbamate of the formula (I), in particular to the modi fication I, to processes for their preparation, to medicaments comprising them and to their use for fighting diseases.