| Abstract
| - A new seco-labdane-type diterpenoid, chapecoderin A (1), and two new rearranged labdane-typediterpenoids, chapecoderins B (2) and C (3), were isolated from the leaves of the Brazilian medicinalplant Echinodorus macrophyllus (“Chapéu-de-couro”), and their structures and relative stereochemistrywere elucidated by spectroscopic data. Chapecoderins A−C (1−3) possess in common an α,β-unsaturatedγ-lactone ring in the side chain.
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