ThiophenolThiosalicylic acid is an organosulfur compound containing carboxyl and sulfhydryl functional groups. Its molecular formula is C6H4(SH)(CO2H). it is a yellow solid that is slightly soluble in water, ethanol and diethyl ether, and alkanes, but more soluble in DMSO. Thiosalicylic acid is an organosulfur compound containing carboxyl and sulfhydryl functional groups. Its molecular formula is C6H4(SH)(CO2H). it is a yellow solid that is slightly soluble in water, ethanol and diethyl ether, and alkanes, but more soluble in DMSO. Thiosalicylic acid is prepared from 2-aminobenzoic acid via diazotization. Thiosalicylic acid is a precursor to the dyestuff thioindigo. Thiosalicylic acid is also used to make the vaccine preservative thiomersal. It is a precursor to drug candidates for treatment of atherosclerosis and melanoma.