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In the title compound, C7H8N4S, the methyl C atom is displaced by 1.232 (7) Å from the mean plane of the pyrazolo­[3,4-d]pyrimidine ring system (r.m.s. deviation = 0.007 Å). The N—N—C—Cm (m = meth­yl) torsion angle is −60.3 (6)°. In the crystal, mol­ecules are linked by N—H...S hydrogen bonds, generating [010] chains, which are reinforced by C—H...N inter­actions. The chains are cross-linked by weak C—H...S hydrogen bonds, generating (001) sheets.

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In the title compound, C8H8N4S, the pyrazolo­[3,4-d]pyrimidine ring system is essentially planar, with a maximum deviation from the mean plane of 0.025 (3) Å. The allyl group is disordered over two sites in a 0.512 (6):0.488 (6) ratio. In the crystal, mol­ecules are linked by pairs of N—H...N hydrogen bonds, forming inversion dimers with an R22(8) graph-set motif.
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