title: Chapecoderins A-C, new labdane-derived diterpenoids from Echinodorus macrophyllus.
abstract: A new seco-labdane-type diterpenoid, chapecoderin A (1), and two new rearranged labdane-type diterpenoids, chapecoderins B (2) and C (3), were isolated from the leaves of the Brazilian medicinal plant Echinodorus macrophyllus ("Chapéu-de-couro"), and their structures and relative stereochemistry were elucidated by spectroscopic data. Chapecoderins A-C (1-3) possess in common an alpha,beta-unsaturated gamma-lactone ring in the side chain.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan. jkobay@pharm.hokudai.ac.jp
authors.forename: J
authors.initials: J
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Sekiguchi
authors.forename: H
authors.initials: H
authors.lastname: Shigemori
authors.forename: A
authors.initials: A
authors.lastname: Ohsaki
mesh_terms: D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D013057:Spectrum Analysis