51649-83-3 6-Amino-3',6'-dihydroxyspiro(isobenzofuran-1(3H),9'-(9H)xanthene)-3-one EINECS 257-334-7 Fluoresceinamine isomer II Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 6-amino-3',6'-dihydroxy-