Based on the similarity of its ). Thus, units I and II had to be doubly linked as in 5. The C method was used to determine the absolute configuration of unit IV. Unit IV was identified as ent-epicatechin based on the closer resemblance of its C NMR resonance patterns with those of corresponding carbons in 6 rather than with those in 4 (Table ). Collectively, this verified the structure of 22 to be [PAC 5]-(4→6)-[ PAC 6].