CAS 590355-40-1 appears in our catalog under these names: 5-Ethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxylic acid, 95%, 5-Ethyl-4,5,6,7-tetrahydrobenzo(b)thiophene-2-carboxylic acid, 95+%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 250mg, 10g, 5g, 1g.