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A new indigoid derivative, bisindigotin (1), with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-antagonistic activity was isolated from the ethanol extract of the Chinese medicinal herb Isatis indigotica. Its structure was determined by spectroscopic methods. In the human HepG2 hepatoma cell model, 1 (50 nM to 2 microM) was found to dose-dependently inhibit TCDD-induced ethoxyresorufin O-deethylase (EROD) activity.
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Wei et al. (2005) studied this question.
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