1. A composition suitable for reconstitution in an aqueous suspension containing 5 - [[4 - [(2,3-dimethyl-2H-indazol-6-yl) methylamino] -2-pyrimidinyl] amino] -2-methylbenzenesulfonamide hydrochloride and guar gum. 2. The composition of claim 1, further comprising polyvinylpyrrolidone. 3. A composition according to claim 1 or 2, wherein said guar gum is present in an amount of from 3% to 8% by weight of the composition. The composition according to any one of paragraphs. 1 and 2, where the specified polyvinylpyrrolidone is present in an amount of from 3% to 12% by weight of the composition. The composition according to any one of paragraphs. 1 and 2, wherein said 5 - [[4 - [(2,3-dimethyl-2H-indazol-6-yl) methylamino] -2-pyrimidinyl] amino] -2-methylbenzenesulfonamide hydrochloride is micronized. 6. The composition of claim 5, wherein said micronized hydrochloride 5 - [[4 - [(2,3-dimethyl-2H-indazol-6-yl) methylamino] -2-pyrimidinyl] amino] -2-methylbenzenesulfonamide has a particle size distribution such that more than 90% of the particles have a size of from 0.61 to 10.0 microns. 7. The composition according to any one of paragraphs. 1 and 2, where when recovering the specified composition into an aqueous suspension, it has a pH from 3.0 to 4.2.8. The composition according to any one of paragraphs. 1 and 2, where when recovering the specified composition into an aqueous suspension, it has a pH from 3.5 to 4.0.9. Direct mixing powder for use in a pharmaceutical composition containing 1) 5 - [[4 - [(2,3-dimethyl-2H-indazol-6-yl) methylamino] -2-pyrimidinyl] amino] -2-methylbenzenesulfonamide hydrochloride, 2) thickener, 3) suspending agent, 4) surfactant, 5) buffer, 6) preservative, 7) release agent or glidant, 8) sweetener and 9) flavoring. 10. The powder according to claim 9, containing1) 35.0-50.0 wt./mass. % micronized hydrochloride 5 - [[4 - [(2,3-dimethyl-2H-i�
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