title: Diterpenoids from Isodon enanderianus.
abstract: Four ent-kauranoids, 6-epiangustifolin and enanderinanins F-H, as well as 11 known ent-kaurane diterpenoids, macrocalin B, xerophilusin A, trichorabdal A, trichorabdal B, effusin, angustifolin, longikaurin D, longikaurin F, enanderinanin B, xerophilusin G and shikokianin were isolated from the aerial parts of Isodon enanderianus. The new diterpenoids were identified as 6-epiangustifolin (11alpha-hydroxy-6alpha-methoxy-6,19-epoxy-6,7-seco-ent-kaur-16-en-15-one-7,20-olide), enanderinanin F (19-acetoxy-6,20:6,11beta-diepoxy-6,7-seco-ent-kaur-16-en-15-one-1beta,7-olide), enanderinanin G (1beta,6beta,7beta-trihydroxy-19-acetoxy-16beta-methoxymethyl-7alpha,20-epoxy-ent-kaur-15-one) and enanderinanin H (6beta,7beta,14beta-trihydroxy-1alpha,11beta-acetonide-7alpha,20-epoxy-ent-kaur-16-en-15-one), respectively, on the basis of spectral data, especially by 2D NMR techniques. 6-Epiangustifolin showed significant cytotoxic activity against K562 cell.
authors: Laboratory of Phytochemistry, Kunming Institute of Botany, Academia Sinica, Kunming, 650204, Yunnan, People's Republic of China.
authors: Zhi
authors: Z
authors: Na
authors: Wei
authors: W
authors: Xiang
authors: Xue-Mei
authors: XM
authors: Niu
authors: Shuang-Xi
authors: SX
authors: Mei
authors: Zhong-Wen
authors: ZW
authors: Lin
authors: Chao-Ming
authors: CM
authors: Li
authors: Han-Dong
authors: HD
authors: Sun
mesh_terms: D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D006801:Humans; D020014:K562 Cells; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008516:Medicine, Chinese Traditional; D015394:Molecular Structure
chemical_list: D004224:Diterpenes