CAS 519016-71-8 appears in our catalog under these names: Methyl 2-[(chloroacetyl)amino]-4,5,6,7,8,9-hexahydrocycloocta[b]thiophene-3-carboxylate, 95%, Methyl 2-(2-chloroacetamido)-4,5,6,7,8,9-hexahydrocycloocta(b)thiophene-3-carboxylate, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 5g.