CAS 78521-39-8 appears in our catalog under these names: 6-([(4-Methylphenyl)sulfonyl]amino)hexanoic acid, 95%, 6-(4-Methylphenylsulfonamido)hexanoic acid 95%, 6-[[(4-Methylphenyl)sulfonyl]amino]hexanoic acid, 95%, 95%, 6-(4-Methylphenylsulfonamido)hexanoic acid, 95%. Offered by: Combi-blocks, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 5g, 250mg.