fluorescein (lactone form)3',6'-dihydroxyfluoran3,6-fluorandiol9-(o-carboxyphenyl)-6-hydroxy-3-isoxanthenone9-(o-carboxyphenyl)-6-hydroxy-3H-xanthen-3-oneC.I. 45350C.I. Solvent Yellow 94D and C Yellow No. 7D&C Yellow No. 7FluoreszeinJapan Yellow 201Solvent Yellow 94Yellow fluoresceinfluorescein lactonefluoresceineresorcinolphthalein