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The triazoloquinazole fused-ring system of the title compound, C 10 H 7 ClN 4 O 2 S, is essentially planar (r.m.s. deviation = 0.009 Å). In the methyl­sulfonyl substituent, the two S—O bonds are of equal length [1.402 (2) Å]. In the crystal, adjacent mol­ecules inter­act weakly through Cl⋯N contacts [ ca  3.197 (2) Å].

5-Chloro-2-methylsulfonyl-1,2,4-triazolo[1,5-a]quinazoline