Sodium thiosulfate<unk>  (sometimes spelled<unk>  is a colorless crystalline compound that is more familiar as the pentahydrate,<unk> •5H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”
The thiosulfate anion is tetrahedral in shape and is notionally derived by replacing one of the oxygen atoms by a sulfur atom in a sulfate anion.  The S-S distance indicates a single bond, implying that the sulfur bears significant negative charge and the S-O interactions have more double bond character. The first protonation of thiosulfate occurs at sulfur.
Sodium thiosulphate
Mannosulfan
Imidazolidinyl urea
Zinc gluconate
Penicillamine
Indigotindisulfonate
Sodium aurothiomalate
Furathiocarb