BLUE TETRAZOLIUM DIFORMAZAN, Tctrazolium blue, TETRAZOLIUM BLUE DIFORMAZANE, 3,3'-Dimethoxy-4,4'-bis-(3,N'''-diphenyl-formazano)-biphenyl, BTDF, TETRAZOLIUM BLUE DIFORMAZAN, 1,1'-(3,3'-dimethoxy-4,4'-biphenylylene)bis[3,5-diphenylformazane], DITETRAZOLIUM DIFORMAZAN, 3,5,3',5'-Tetraphenyl-1,1'-(3,3'-dimethoxy-biphenyl-4,4'-diyl)-di-formazan