Synthesis of condensed tannins. Part 5. The first angular [4,6 : 4,8]-triflavonoids and their natural counterparts. - Botha,J.J.; Viviers,P.M.; Young,D.A.; Du Preez,I.C.; Ferreira,D.; Roux,D.G.; Hull,W.E. (J Chem Soc [Perkin I], 1982)