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The triazoloquinazoline fused-ring system of the title compound, C 10 H 8 N 4 O 3 S, is essentially planar (r.m.s. deviation = 0.027 Å). In the crystal, adjacent mol­ecules are linked by N—H⋯O sulfon­yl  hydrogen bonds, generating a helical chain running along the  b  axis.

2-Methylsulfonyl-1,2,4-triazolo[1,5-a]quinazolin-5(4H)-one