Syntheses and structural evidence are reported for the ortho, meta, and para isomers of (2- aminoethy1dithio)-benzoic acid and for various derivatives. The ortho isomer was protective against lethal effects of ionizing radiation, but related substances were not. The ortho isomer exists in two isomorphic forms. Efforts to cyclize the orlho isomer to the eight-membered lactam gave polymeric products, susceptible to further polymerization, suggesting that the ...
