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Conclusive spectral evidence for the structure of categallin (V), pyrogallin (VI), and erycetin (VIII), three flavanotropolones related to theaflavin (I) and purpurogallin (IX), is presented. The synthetic, chromatographic, and spectroscopic data for four simpler hydroxybenzotropolones are also recorded and discussed.
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Takino et al. (1967) studied this question.
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