1,3-Propanedithiol, 2-(mercaptomethyl)-2-methyl-, cyclic phosphorotetrathioate (1:1) 18818-33-2 2,6,7-Trithia-1-phosphabicyclo(2.2.2)octane, 4-methyl-, 1-sulfide BRN 2253332 Phosphorotetrathioic acid, cyclic ester with 2-(mercaptomethyl)-2-methyl-1,3-propanedithiol