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) Å].
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