CAS 23785-21-9 appears in our catalog under these names: Etomidate Impurity 9 (Ethyl 4-Imidazolecarboxylate), Ethyl imidazole-4-carboxylate, 98%, Ethyl 1h-imidazole-4-carboxylate, 98%, 4-Carbethoxyimidazole, Ethyl 4–Imidazolecarboxylate. Offered by: Chemat Brand, Combi-blocks, TRC, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: on request, 25g, 1g, 5g, 100g, 250mg, 10g, 500g.