2',7'-bis(carboxyethyl)-5(6)-carboxyfluorescein 85138-49-4 BCECF Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-2',7'-dipropanoic acid, ar-carboxy-3',6'-dihydroxy-3-oxo-, (2S-(1(R*(R*)),2alpha,3abeta,7abeta))- Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-2',7'-dipropanoic acid,5(or 6)-carboxy-3',6'-dihydroxy-3-oxo-