CAS 1072-84-0 appears in our catalog under these names: 4(5)-Imidazolecarboxylic acid, 98%, 1H-imidazole-4-carboxylic acid, 97%, 1H-Imidazole-5-carboxylic acid, 95%, 1H–Imidazole–4–carboxylic acid, Imidazole-4-carboxylic acid, 98% . Offered by: Combi-blocks, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth, Thermo Scientific (Acros). Available pack sizes: 25g, 5g, 100g, 1g, 10g, 50g, 500g, 250g.