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Structural representation of a procyanidin molecule consisting of catechin and epicatechin subunits which are the main constituents of Pycnogenol (PYC). The catechin and epicatechin units can be linked by different bonds, the main being C4-C8 bonds and C4-C6 bonds as well as C4-C8 bonds with different chain lengths up to dodecamers.
