CAS 107021-38-5 appears in our catalog under these names: 5-Bromo-4-chloro-3-indolyl-^a- , 5-Bromo-4-chloro-3-indolyl-alpha-d-galactopyranoside, 95%, X-alpha-Gal/ 99.7% (existing batch purity), 5–Bromo–4–Chloro–3–Indolyl–Alpha–D–Galactopyranoside, 5-Bromo-4-chloro-3-indoxyl-alpha-D-galactopyranoside. Offered by: Thermo Scientific (Alfa Aesar), Combi-blocks, TargetMol, GLPBio, Biosynth. Available pack sizes: 1g, 250mg, 5g, 5mg, 10mg, 25mg, 50mg, 100mg.