[Studies on hydroxyfluoran and its derivatives as organic reagents. 8. Synthesis of 3',4',5',6'-tetrahydroxyfluoran derivatives and 2a, b and determination of bismuth 21 and antimony].
D000965:Antimony / Q000032:analysis*; D001572:Benzofurans / Q000138:chemical synthesis*; D001729:Bismuth / Q000032:analysis*; D004952:Esters / Q000138:chemical synthesis; D007202:Indicators and Reagents / Q000138:chemical synthesis*; D007477:Ions; D008670:Metals; D014966:Xanthenes / Q000138:chemical synthesis*
D001572:Benzofurans; D004952:Esters; D007202:Indicators and Reagents; D007477:Ions; D008670:Metals; D014966:Xanthenes; D000965:Antimony; D001729:Bismuth