1-Piperazinepropanesulfonic acid, 4-(2-hydroxyethyl)- 16052-06-5 4-(2-Hydroxyethyl)-1-piperazinepropane sulfonic acid 4-(2-Hydroxyethyl)-1-piperazinepropanesulfonic acid 4-(2-Hydroxyethyl)-1-piperazinepropanesulphonic acid BRN 3957385 EINECS 240-198-8 EPPS Hepps