Two new cembrane diterpenoids with an eight-membered lactone ring, echinodolides A (1) and B (2), were isolated from the leaves of the Brazilian medicinal plant Echinodorus macrophyllus ("Chapéu-de-couro"), and the structures and relative stereochemistry were elucidated from their spectroscopic data.
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Shigemori et al. (2002) studied this question.