3‐(2‐Furyl)‐6‐(4‐methyl­phenyl)‐7H‐1,2,4‐triazolo­[3,4‐b][1,3,4]thia­diazine and its 6‐phenyl analogue

In the title compounds, C₁₅H₁₂N₄OS, (I), and C₁₄H₁₀N₄OS, (II), the thia­diazine ring adopts a skew‐boat conformation, while the triazole and furyl rings are essentially planar. The phenyl group is twisted by 33.5 (2) and 47.9 (1)° out of the triazole‐ring plane in (I) and (II), respectively.