51306-35-5 68425-77-4 Dichlorotriazinylaminofluorescein I.dihydrochloride Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 5-((4,6-dichloro-1,3,5-triazin-2-yl)amino)-3',6'-dihydroxy-, dihydrochloride