The CD spectrum of 5 showed an intensive positive Cotton effect at 232 and 237 nm, establishing the chiralities of biphenyl moieties in 5 to be all S-configurations. On the basis of these findings, the structure of cocciferin T2 was elucidated as 5. Cocciferin T2 is the first example of a trimeric hydrolyzable tannin composed of a C-glucosidic tannin monomer and ellagitannins with a C1 glucopyranose core.