CAS 667436-19-3 appears in our catalog under these names: Methyl 6-tert-butyl-2-[(cyanoacetyl)amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate, 95%, Methyl 6-(tert-butyl)-2-(2-cyanoacetamido)-4,5,6,7-tetrahydrobenzo(b)thiophene-3-carboxylate, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 5g, 250mg.