1,2-Ethanediol, 1-chloromethyl-, cyclic sulfite 1,2-Propanediol, 3-chloro-, cyclic sulfite (ester) 1,3,2-Dioxathiolane, 4-(chloromethyl)-, 2-oxide 15121-11-6 3-Chloro-1,2-propanediol cyclic sulfite (ester) 4-(Chloromethyl)-1,3,2-dioxathiolane 2-oxide AI3-27589 EINECS 239-175-5