Two New Labdane Diterpenes from Fresh Leaves of <i>Leonurus japonicus</i> and Their Degradation during Drying

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  • Fuchino Hiroyuki
    Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation
  • Daikonya Akihiro
    Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation
  • Kumagai Takeo
    Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation
  • Goda Yukihiro
    Division of Pharmacognosy, Phytochemistry and Narcotics, National Institute of Health Sciences
  • Takahashi Yutaka
    MS-Solutions Ltd.
  • Kawahara Nobuo
    Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation

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  • Two New Labdane Diterpenes from Fresh Leaves of Leonurus japonicus and Their Degradation during Drying
  • ChemInform Abstract: Two New Labdane Diterpenes from Fresh Leaves of Leonurus japonicus and Their Degradation During Drying.

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Degradation of the components of Leonurus Herb was examined during drying. Compounds 1 and 2 were detected on TLC at lower temperature, but not at higher temperature. Their chemical structures were determined by spectral methods. They immediately decomposed even at 40°C in chloroform solution. They are believed to be transformed through a retro-aldol reaction. Compounds 1 and 2 have not been previously reported.

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