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In the title compound, C16H17ClN4O2S, the bicyclic triazolopyrimidine ring system is nearly planar and oriented with respect to the benzene ring at a dihedral angle of 87.24&#8197;(3)&#176;. In the crystal structure, intermolecular N&#8212;H...N hydrogen bonds link the molecules into centrosymmetric dimers; an intramolecular C&#8212;H...O hydrogen bond is also present

Ethyl 5-chloromethyl-2-methylsulfanyl-7-phenyl-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidine-6-carboxylate