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The metabolism of 7-(4-Chlorbenzyl)-7,8,13,13a-tetrahydroberberine chloride(CTHB), a potential anti-arrhhmia and anti-ischetmia drug,was studied in rat bile A metabolite and unchanged CTHB were found in the bile. Characterization and structural elucidation of the metabolite was achieved by LC/MS and LC/NMR