2-19-00-00413 (Beilstein Handbook Reference) 4424-03-7 BRN 0053358 Benzenesulfonic acid, O-(3,6,9-trihydroxyxanthen-9-yl)-, gamma-sultone (7CI) EINECS 224-596-9 Spiro(3H-2,1-benzoxathiole-3,9'-(9H)xanthene)-3',6'-diol 1,1-dioxide Sulfonefluorescein