Eryvarins F and G, two 3-phenoxychromones from the roots of Erythrina variegata.

@article{Tanaka2003EryvarinsFA,
  title={Eryvarins F and G, two 3-phenoxychromones from the roots of Erythrina variegata.},
  author={Hitoshi Tanaka and Miyuki Hirata and Hideo Etoh and Hiroshi Shimizu and Magoichi Sako and Jin Murata and Hiroko Murata and Dedy Darnaedi and Toshio Fukai},
  journal={Phytochemistry},
  year={2003},
  volume={62 8},
  pages={
          1243-6
        }
}
Two 3-phenoxychromones, eryvarins F and G, were isolated from the roots of Erythrina variegata. Their structures were established to be 3-(2,4-dihydroxyphenoxy)-7-hydroxy-6,8-di(3,3-dimethylallyl)chromen-4-one and 3-(2,4-dihydroxyphenoxy)-8-(3,3-dimethylallyl)-2,2-dimethylpyrano[5,6:6,7]chromen-4-one on the basis of spectroscopic and chemical evidence. Eryvarins F and G are unusual 3-phenoxychromone derivatives with two isoprenoid groups. 

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