1. Diacetates of the four possible racemates of 4',7-dimethoxyflavan-3,4-diol have been synthesized. 2. Comparison of their nuclear-magnetic-resonance spectra and the ionophoretic mobilities of the diols in borate buffer with those of the corresponding derivatives of guibourtacacidin shows that the
1. Rhodesian copalwood (Guibourtia coleosperma) contains three diastereo-isomeric leuco-fisetinidins. These consist of the (-)-2,3-cis-3,4-cis (2R,3R,4R) and (-)-2,3-cis-3,4-trans (2R,3R,4S) 3',4',7-trihydroxyflavan-3,4-diols, and the third was shown to be a 2,3-trans-3,4-cis isomer by means of