CAS 81926-28-5 appears in our catalog under these names: Methyl 4-(chlorosulfonyl)butanoate, 95%, Methyl 4-(chlorosulfonyl)butanoate, Methyl 4-(chlorosulphonyl)butanoate 95%, Methyl 4-(chlorosulfonyl)butanoate, 95%, 95%, Methyl 4-chlorosulfonyl-butanoate, 95%. Offered by: Combi-blocks, Biosynth, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 250mg, 100mg, 5g.