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Investigation of the aerial parts of Rhyncholacis penicillata afforded the new chromenes, 7-hydroxy-6-(3-methylbutyryl)-5-oxymethyl-chromene (rhynchonin A) and 7-hydroxy-6-(2-methylbutyryl)-6-oxymethylchromene (rhynchonin B). Structures were elucidated by spectroscopic methods and independent synthesis. Rhynchonin A showed broad insecticidal, acaricidal and nematicidal potency including strong biological activity against Heliothis zea.


G Burkhardt, H Becker, M Grubert, J Thomas, T Eicher. Bioactive chromenes from Rhyncholacis penicillata. Phytochemistry. 1994 Dec;37(6):1593-7

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PMID: 7766000

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