title: Two new labdane diterpenes from fresh leaves of Leonurus japonicus and their degradation during drying.
abstract: 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.
authors: Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation, 1-2 Hachimandai, Tsukuba, Ibaraki 305-0843, Japan. fuchino@nibio.go.jp
authors: Hiroyuki
authors: H
authors: Fuchino
authors: Akihiro
authors: A
authors: Daikonya
authors: Takeo
authors: T
authors: Kumagai
authors: Yukihiro
authors: Y
authors: Goda
authors: Yutaka
authors: Y
authors: Takahashi
authors: Nobuo
authors: N
authors: Kawahara
mesh_terms: D002855:Chromatography, Thin Layer; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D031332:Leonurus / Q000737:chemistry*; D013058:Mass Spectrometry; D008968:Molecular Conformation; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*; D018515:Plant Leaves / Q000737:chemistry*; D013696:Temperature
chemical_list: D004224:Diterpenes; D010936:Plant Extracts; C433017:labdane