Ethyl 2-(3-methyl-5-sulfanyl­idene-4,5-dihydro-1H-1,2,4-triazol-4-yl)acetate

The title compound, C₇H₁₁N₃O₂S, exists in the 5-thioxo tautomeric form. The 1,2,4-triazoline ring is essentially planar, with a maximum deviation of 0.010 (2) Å for the substituted N atom. The ethyl acetate substituent is almost planar, with a maximum deviation of 0.061 (4) Å for the methyl­ene C atom of the eth­oxy group. The angle between the mean plane of this substituent and the mean plane of the 1,2,4-triazoline ring is 89.74 (8)°. In the crystal, mol­ecules are linked by a combination of N—H...S, C—H...N and C—H...O hydrogen bonds into chains parallel to [100].