CAS 68189-43-5 appears in our catalog under these names: Popso, 95%, POPSO, Piperazine-1,4-bis(2-hydroxypropanesulfonic Acid) Dihydrate [Good's buffer component for biological research], POPSO, 98.00%, POPSO 97%. Offered by: Combi-blocks, GLPBio, TCI, Chemat, Ambeed. Available pack sizes: 5g, 100g, 500g, 25g, 1000g, 25 g, 1kg.