Five proanthocyanidin dimers were obtained by depolymerizing PT40 using (+)-catechin and EGCG as chain breakers.
Three dimer analogues with the C-ring-opened structural unit were tentatively identified and reported for the first time.
The formation of the C-ring-opened diaryl-propan-2-gallate unit on dimer analogues enhanced their antioxidant potency.
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