Havardic acids A-F and havardiol,labdane diterpenoids from Grindelia havardii |
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| Institution: | 1. The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate 020-8550, Japan;2. Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan;3. Graduate School of Arts and Sciences, Iwate University, Morioka, Iwate 020-8550, Japan;1. Centre for Synthetic Biology of Fine and Speciality Chemicals, Manchester Institute of Biotechnology, School of Chemistry, The University of Manchester, Manchester, M1 7DN, UK |
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| Abstract: | Seven new labdane diterpenoids, designated as havardic acids A-F (as methyl esters) and havardiol, have been obtained from the dichloromethane extract of the aerial parts of Grindelia havardii, and their structures have been deduced on the basis of NMR, MS and IR data. Havardic acid E has lost carbons-14 and -15, whereas havardic acid F and havardiol have lost carbon-17. |
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