CAS 367-93-1 appears in our catalog under these names: Isopropyl-beta-D-thiogalactopyranoside (IPTG), dioxane free,, Isopropyl-^b-D-thiogalactoside, dioxane-free, 99% . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 1g, 5g, 25g, 100g.