1-Piperazinepropanesulfonic acid, beta-hydroxy-4-(2-hydroxyethyl)- 68399-78-0 EINECS 269-990-1 N-(Hydroxyethyl)piperazine-N'-2-hydroxypropanesulfonic acid NSC 374113 beta-Hydroxy-4-(2-hydroxyethyl)piperazine-1-propanesulphonic acid