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Bioassay-guided fractionation of Berberis tabiensis against Culex quinquefasciatus third instar larvae afforded a new bisbenzyltetrahydroisoquinoline alkaloid having an unusual head-head binding pattern. This new alkaloid (tabienine B) is the first member of this family found to possess a diphenyl ether bridge in C-6 and C-7'.
The larvicidal potential of several dopamine 1-phenylisoquinoline derivatives against Culex quinquefasciatus third instar larvae was investigated in a rational search for insecticides. The results showed that these isoquinolines presented moderate larvicidal activity, that the presence of a substituent is needed on carbon 1 for such activity to be presented(More)
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