CAS 17243-13-9 appears in our catalog under these names: 5-Chlorosulfonyl-2-hydroxybenzoic acid, 98%, 5–(Chlorosulfonyl)salicylic acid, 5-(Chlorosulfonyl)salicylic acid, 97% , 5-Chlorosulfonyl-2-hydroxybenzoic acid, 5-(Chlorosulfonyl)-2-hydroxybenzoic acid 95%. Offered by: Combi-blocks, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth, Ambeed. Available pack sizes: 1g, 10g, 25g, 5g, 100g, 50g.