Germacranolides from Calea urticifolia.

@article{Yamada2004GermacranolidesFC,
  title={Germacranolides from Calea urticifolia.},
  author={M. Yamada and N. Matsuura and Hiroto Suzuki and Chihiro Kurosaka and Naoko Hasegawa and M. Ubukata and Toŝhiyuki Tanaka and M. Iinuma},
  journal={Phytochemistry},
  year={2004},
  volume={65 23},
  pages={
          3107-11
        }
}
Four germacranolides, named calealactones A-C and calealactone B [corrected] were isolated from the leaves of Calea urticifolia (Compositae) in addition to three known germacranolides. Their structures were established on the basis of spectroscopic analysis including by 2D NMR spectroscopy. Calealactone C and 2,3-epoxyjuanisulamin displayed potent toxicity to U937 cells. 
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The approximately 125 species of the genus Calea L. (Asteraceae) are distributed throughout tropical and subtropical regions of the Americas. Some species have medicinal properties. Based on popularExpand
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Abstract The investigation of Calea urticifolia afforded eight new germacranolides. While five are heliangolides, three are of a new type and have some unusual structural features. The structures areExpand
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TLDR
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