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In the title compound, C 24 H 20 N 2 O 5 S·C 3 H 7 NO, a benzene ring is positioned axially to the pyrimidine ring, which adopts a twist-boat conformation, and is inclined to its mean plane by 85.36 (7)°. In the crystal, inter­molecular C—H⋯O inter­actions result in centrosymmetric head-to-head dimers with an  R   2   2 (14) graph-set motif along the  b  axis. Pairs of C—H⋯O and O—H⋯O hydrogen bonds form centrosymmetric head-to-head dimers about inversion centres, corresponding to an  R   2   2 (7) graph-set motif along the  a  axis.

acta crystallographica. section e

Ethyl 2-(4-carboxybenzylidene)-7-methyl-3-oxo-5-phenyl-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidine-6-carboxylate–N,N-dimethylformamide (1/1)