1H-Imidazole-4-carboxylic acid, 2,3-dihydro-3-methyl-2-thioxo-, methyl ester 2-Mercapto-1-methylimidazole-5-carboxylic acid methyl ester 68892-07-9 EINECS 272-595-7 Methyl 2,3-dihydro-3-methyl-2-thioxo-1H-imidazole-4-carboxylate