Dithizone silver complex; 

2,3-Diphenyltetrazolium-5-thiolate; Dithizone, dehydro- (7CI);1H-Tetrazolium,2,5-dihydro-2,3-diphenyl-5-thioxo-, inner salt (9CI);5H-Tetrazolium,3,4-dihydro-2,3-diphenyl-5-thioxo-, inner salt; Dehydrodithizone; 5-Mercapto-2,3-diphenyl-2H-tetrazoliumhydroxide, inner salt; 5-Tetrazolidinethione,2,3-diphenyl-, meso-ionic didehydro deriv. (8CI);