N-(2-Hydroxyethyl)-Piperazine-N'-(2-Ethanesulfonic Acid). N-(2-Hydroxyethyl)-Piperazine-N'-(2-Ethanesulfonic Acid), VWR, US manufactured. Chemical synthesis. Bovine Spongiform Encephalopathy /Transmissible Spongiform Encephalopaties Free, Cas number: 77365-45-9, HEPES Free Acid, 25kg