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In the title compound, C8H10N2OS, the 3-(dimethylamino)prop-2-en-1-one unit is approximately planar [give r.m.s. deviation] and the mean plane through the seven non-H atoms makes a dihedral angle of 8.88 (3)° with the thiazole ring. The carbonyl and ring C=N double bonds adjacent to the carbonyl group are trans [N—C—C—O = 172.31 (15) °], while the conformation of the carbonyl and propene double bonds is cis [O—C—C—C = 2.2 (2)°]. In the crystal, short C—H...N and C—H...O interactions together with C—H...π interactions generate a three-dimensional network.