Abstract
The structure of ethyl 2-amino-4-tert-butyl-1,3-thiazole-5-carboxylate, C10H16N2O2S, (I), and the structure of the 1:1 adduct 6-methylimidazo[2,1-b]thiazole–2-amino-1,3-thiazole (1/1), C6H6N2S·C3H4N2S, (II), have been determined. The molecules in (I) associate via a hydrogen-bonded R{_2^2}(8) dimer consisting of N—H⋯N interactions, with the hydrogen-bonding array additionally involving N—H⋯O interactions to one of the carboxylate O atoms. The 2-aminothiazole molecules in (II) also associate via an N—H⋯N hydrogen-bonded R{_2^2}(8) dimer, with an additional N—H⋯N interaction to the Nsp2 atom of the imidazothiazole moiety, creating hydrogen-bonded quartets.
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