Ethyl 2-benzyl-sulfanyl-7-(2-chloro-phen-yl)-5-methyl-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidine-6-carboxyl-ate.

In the title compound, C(22)H(21)ClN(4)O(2)S, the bicyclic triazolopyrimidine ring system is nearly planar, and oriented at dihedral angles of 89.45†(3)° with respect to the chlorobenzene ring and 87.03†(3)° with respect to the terminal phenyl ring. In the crystal structure, mol-ecules are linked by π-π stacking inter-actions between the triazolopyrimidine rings [centroid-centroid distances of 3.88†(1) and 3.63†(1)†à ].