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Comparison of negative ion MALDI-ToF/ToF mass spectra of procyanidin trimers with different types of bonding between the catechin/epicatechin subunits. (A) A-type procyanidin trimer with two bonds between monomeric subunits. (B) B-type procyanidin trimer with one bond between the subunits; and (C) mixed type procyanidin trimer with both A-type and B-type bonds between subunits.
