1528-73-0 16574-43-9 AI3-63055 Bromopyrogallol red EINECS 240-632-6 NSC 315537 Pyrogallol bromine red Spiro(3H-2,1-benzoxathiole-3,9'-(9H)xanthene)-3',4',5',6'-tetrol, 2',7'-dibromo-, 1,1-dioxide alpha-(5-Bromo-2,3-dihydroxy-4-oxo-2,5-cyclohexadienylidene)-alpha-(5-bromo-2,3,4-trihydroxyphenyl)toluenesulphonic acid