Definition: Compounds that contain three methine groups. They are frequently used as cationic dyes used for differential staining of biological materials.
stains-all [ 3,3'-diethyl-9-methyl-4,5,4',5'-dibenzothiacarbocyanine,4,5,4',5'-dibenzo-3,3'-diethyl-9-methyl-thiacarbocyanine bromide,stains-all tosylate ] cationic dye; RN given refers to bromide salt