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- Δ8 Labdanes from Halimium VerticillatumPublication . Urones, J. G.; Marcos, I. S.; Moro, R. F.; López Rodilla, Jesus Miguel; Mendonça, António José Geraldes deThree new acids in the form of methyl esters and the acetyl derivative of an alcohol have been isolated from Halimium verticillatum. Their structures have been established by spectroscopic methods and/or chemical correlations as those of methyl 15hydroxy-7-oxo-8-labden-17-oate, methyl 7a,l5-dihydroxy-glabden-17-oate, methyl 7/3,15-dihydroxy-8-labden-17-oate and 17-nor-15acetoxy-7-oxo-8-labdene.