Sodium aurothiosulfate
Encyclopedia
Sodium aurothiosulfate is the inorganic compound
Inorganic compound
Inorganic compounds have traditionally been considered to be of inanimate, non-biological origin. In contrast, organic compounds have an explicit biological origin. However, over the past century, the classification of inorganic vs organic compounds has become less important to scientists,...

 with the formula
Chemical formula
A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....

 Na3Au(S2O3)2·2H2O, although a formule more accurate picturing this compound would be: Na3[Au(S2O3)2]. This salt contains an anionic linear coordination complex of gold(I) bound to two thiosulfate
Thiosulfate
Thiosulfate is an oxyanion of sulfur. The prefix thio indicates that thiosulfate ion is a sulfate ion with one oxygen replaced by a sulfur. Thiosulfate occurs naturally and is produced by certain biochemical processes...

 ligands. Like several other gold compounds, this species is used as an antirheumatic.
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