Synonyms: | PYROGALLIC ACID RED;PYROGALLIC ACID;1,2,3-TRIHYDROXYBENZENE RED;1,2,3-BENZENETRIOL RED;2-(6H-6-oxo-3,4,5-trihydroxyxanthen-9-yl)benzenesulphonic acid;pyrogallolsulphonephthalein;1,1-diketospiro[benzo[c]oxathiole-3,9'-xanthene]-3',4',5',6'-tetrol;1,1-dioxospiro[benzo[c][1,2]oxathiole-3,9'-xanthene]-3',4',5',6'-tetrol |