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1-methyl-5-mercapto-1, 2, 3, 4-tetrazole, 2-mercapto-1, 3, 4-thiadiazole, methyl isothiocyanate, n-methylthiourea, taurine, 4-hydroxythiobenzamide, triphenylphosphine, sodium azide, trimethylolpropane.