CAS 103404-87-1 appears in our catalog under these names: 4–(2–Hydroxyethyl)piperazine–1–ethanesulfonic acid hemisodium salt, HEPES hemisodium salt , HEPES hemisodium salt, 99.00%, HEPES hemisodium salt 96%, Sodium bis(2-(4-(2-hydroxyethyl)piperazin-1-yl)ethanesulfonate), 96%, 96%. Offered by: GLPBio, Thermo Scientific (Alfa Aesar), Chemat, Ambeed, MedChemExpress. Available pack sizes: 100g, 250g, 500g, 25g, 5g, 100 mg, 5 g, 10 g.