This refers to forms of {4,6-diamino-2 - [1 - (2-fluorobenzyl) - 1H pyrazolo [3,4-b] pyridin-3-yl] pyrimidin-5-yl} methylcarbamate formula (1), in particular the modification I, processes for their Preparation Medicines containing them, and their use for the Treatment Diseases. The Peaks of Angle 2 - Q are 14.7 and 6.1; 22.2.
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