title: Diterpenoids from isodon eriocalyx
abstract: Three new diterpenoids, eriocalyxins C-E (1-3), were isolated from Isodon eriocalyx. Their structures were elucidated as 6beta-hydroxy-15beta-acetoxy-3alpha,20-epoxy-16beta, 17-epoxy-ent-kaur-1,7-dione (1), 1alpha,7beta-dihydroxy-6beta, 15beta-diacetoxy-7,20-epoxy-ent-kaur-16-ene (2), and 15beta-acetoxy-1,6-dioxo-6,7-seco-ent-kaur-2,16-dien-7,20-olide (3), respectively, by means of spectroscopic methods, including one- and two-dimensional NMR techniques.
authors.affiliation: Shanghai Institute of Materia Medica, Academia Sinica, Shanghai 200031, People's Republic of China, Laboratory of Phytochemistry, Kunming Institute of Botany, Academia Sinica, Kunming 650204, People's Republic of China, and Department of.
authors.initials: SN
authors.lastname: Chen
authors.initials: JM
authors.lastname: Yue
authors.initials: SY
authors.lastname: Chen
authors.initials: ZW
authors.lastname: Lin
authors.initials: GW
authors.lastname: Qin
authors.initials: HD
authors.lastname: Sun
authors.initials: YZ
authors.lastname: Chen