0-19-00-00402 (Beilstein Handbook Reference) 2',4',5',7'-Tetrabromo-9-(2-sulfophenyl)-6-hydroxy-3-isoxanthenone 2',4',5',7'-Tetrabromospiro(3H-2,1-benzoxathiole-3,9'-(9H)xanthene)-3',6'-diol 1,1-dioxide 42522-72-5 BRN 0066005 Spiro(3H-2,1-benzoxathiole-3,9'-(9H)xanthene)-3',6'-diol, 2',4',5',7'-tetrabromo-, 1,1-dioxide