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A 6,(17)-epoxylathyrol diterpenoid((2S*3S*4R*5R*6S*9S*11S*15R*)-5,15-diacetoxy-3-phenylacetoxy-14-oxolathyra-6(17),(12E)-diene-6(17)-epoxide) was isolated from the seeds of Euhporbia lathyris L.Its configuration was puzzled because of the incomplete X-ray