1953 年 73 巻 2 号 p. 128-131
As a result of studies on the components of flea bane, Erigeron annuus L. and E. macranthus, white crystals (I), m.p. 117-118°, were obtained from the chloroform-soluble portion of the methanolic extract of the flowers, and these were identified as hydroxy-γ-pyrone, i.e. pyromeconic acid, C5H4O3. The yield was approximately 0.7% of the dried flower. This acid was found only in trace amounts in the stem, and about one-fifth of the amount of flower content in the leaves. This is the first instance of the indication of the presence of this acid in plants. The ether-soluble portion of the said methanolic extract yielded some yellow crystals, and the ethyl acetate-soluble portion yielded a kind of flavone.