2-Hydroxy-3-sulfopropyl 2-methyl-2-propenoate, sodium salt 2-Propenoic acid, 2-methyl-, 2-hydroxy-3-sulfopropyl ester, monosodium salt 2-Propenoic acid, 2-methyl-, 2-hydroxy-3-sulfopropyl ester, sodium salt 5906-94-5