Reactions of sult, ones la aiid lb with cystamine, sodium S-2-aminoethylthiosulfate, and thiones, such as thiosemicarbazide and pyridine-2 (1H)-thione, provided a number of sulfonic acid inner salt derivatives for testing as antiradiation agents. Catalytic hydrogenolysis of the cystamine derivatives afforded~(2-mercaptoethy1amino)-1- alkanevulfonic acids 3a and 3b. Sulfoalkylation products of 2-thiazolidinethione were ...