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N-2-Hydroxyethylpiperazine-N′-2-hydroxypropanesulfonic acid68399-78-031 % similar tert-Butyl 4-(2-hydroxyethyl)piperazine-1-carboxylate77279-24-431 % similar 4-(3-Hydroxypropyl)thiomorpholine 1,1-dioxide205194-33-830 % similar