3',6'-Bis(acetyloxy)spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one 3',6'-Diacetylfluorescein 3-Oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-3',6'-diyl diacetate 596-09-8 EINECS 209-877-6 Fluorescein acetate NSC 4726 NSC 667259 Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-bis(acetyloxy)-