Synonyms:3,3-Bis(1-octyl-2-methylindol-3-yl)phthalide;3,3-Bis(1'-octyl-2'-methylindol-3'-yl)phthalide;3,3-Bis(2-methyl-1-octyl-3-indolyl)phthalide;3,3'-Bis(1-n-octyl-2-methylindol-3-yl)phthalide;3,3'-Bis(1-octyl-2-methylindol-3-yl)phthalide;I 6B;Pergascript I 6B;Pergascript Red I 6B;Red I 6B;Specialty Red 16;