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Lathyranone A (
1), a novel diterpenoid with a rearrangement skeleton, along with a known diterpenoid,
Euphorbia factor L
11 (
2), was isolatedfrom the seeds of
Euphorbia lathyris. The structure and relative stereochemistry of
1 were elucidated by extensive spectroscopic analysis. Apossible biosynthetic pathway for lathyranone A (
1) was proposed.