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Six new andrographolide metabolites M-5-M-10 were isolated from rat urine, feces, and the contents of the small intestine. Three (M-5-M-7) as sulfate ester compounds were identified as new compounds. The structures of these six metabolites were determined to be 14-deoxy-12(R)-sulfo andrographolide 3-sulfate (M-5), 14-deoxy-12(S)-sulfo andrographolide 3-sulfate (M-6), 14-sulfo isoandrographolide 3-sulfate (M-7), 14-deoxy-11,12-didehydroandrographolide (M-8), isoandrographolide (M-9), and 14-deoxy andrographolide (M-10), respectively, based on chemical evidence and spectroscopic analysis.
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He et al. (2003) studied this question.
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