In organosulfur chemistry, a Bunte salt is an archaic name for salts with the formula RSSONa.  They are also called S-alkylthiosulfates or S-arylthiosulfates.  These compounds are typically derived from alkylation on the pendant sulfur of sodium thiosulfate:
:RX  +  NaSO   →  Na[OSR]  +  NaX
They have been used as intermediates in the synthesis of thiols.  They are also used to generate unsymmetrical disulfides:
:Na[OSR]  +  NaSR   →   RSSR  +  NaSO
According to X-ray crystallography, they adopt the expected structure with tetrahedral sulfur(VI) atom, a sulfur-sulfur single bond, and three equivalent sulfur-oxygen bonds.