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Sesquiterpene lactones and diterpene carboxylic acids in Helianthus niveus subspecies Canescens |
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| Authors: | Nobuo Ohno Tom J Mabry |
| Institution: | The Department of Botany, The University of Texas at Austin, Austin, TX 78712, U.S.A. |
| Abstract: | Three new heliangolides (niveusin-A, -B and -C) and three known diterpene carboxylic acids were isolated and characterized from a CHCl3, extract of Helianthus niveus. The structures of the three new lactones were deduced by 1H and 13C NMR as well as extensive decoupling experiments and derivatizations. |
| Keywords: | Compositae heliangolides niveusin-A niveusin-B niveusin-C diterpene carboxylic acids kaurenoic acid grandifloric acid ciliaric acid |
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