CAS 544428-38-8 appears in our catalog under these names: Methyl 2-[(chloroacetyl)amino]-4-ethyl-5-methylthiophene-3-carboxylate, 95%, Methyl 2-(2-chloroacetamido)-4-ethyl-5-methylthiophene-3-carboxylate, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 250mg, 1g, 5g.