(S)-(4,5-Dihydro-5-thioxo-1,3,4-thiadiazol-2-yl) benzenecarbothioate 103288-85-3 5-Mercapto-1,3,4-thiadiazole-2-thiol benzoate 51988-14-8 Benzenecarbothioic acid, S-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl) ester EINECS 257-581-0