抄録
From the action of hot pyridine water and ethanolic sodium acetate solution, ultraviolet absorption spectra, and rotatory dispersion curves of engelitin (I), neoengelitin (II), isoengelitin (III), and neoisoengelitin (IV), it seemed more appropriate to consider that the aglycone portions in (III) and (IV) before hydrolysis are in cis-form. It is thereby assumed that (I) is (+)-dihydrokaempferol 3-L-rhamnoside, (II) is (-)-dihydrokaempferol 3-L-rhamnoside, (III) is probably (-)-epi- or -cis-dihydrokaempferol 3-L-rhamnoside, and (IV) is probably (+)-epi- or -cis-dihydrokaempferol 3-L-rhamnoside.
