Epiafzelechin-(4β→8, 2β→0→7)-ent-afzelechin from Cassipourea gerrardii

Abstract A new A-type proanthocyanidin has been isolated from the bark of Cassipourea gerrardii . Its structure has been established from spectroscopic studies as epiafzelechin-(4β→8, 2β→0→7)- ent -afzelechin. 1 H NMR analysis of R -(+)- and S -(−)-α-methoxy-α-trifluoromethylphenylacetic acid (MTPA) esters of the title compound permits assessment of the absolute stereochemistry at both C-3(C) and C-3(F).