1,3,2-Dioxathiane, 4-methyl, 2-oxide 1,3,2-Dioxathiane, 4-methyl-, 2-oxide 1,3-Butanediol, cyclic sulfite 1,3-Butylene sulphite 4-Methyl-1,3,2-dioxathiane 2-oxide 4-Methyltrimethylene sulfite 4426-51-1 AIDS-159922 AIDS159922 FDA 0477 NSC104116 NSC60195