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Biosynthetic pathways of flavan-3-ols and proanthocyanidins starting from leucoanthocyanidins in tea plant. (a) the ANR pathway to 2R,3R-2,3-cis-flavan-3-ols and 2S,3R-2,3-trans-flavan-3-ols via anthocyanidins and the LAR pathway to 2R,3S-2,3-trans-flavan-3-ols; (b) four stereo structures of catechin. LAR, leucoanthocyanidin reductase; ANS, anthocyanidin synthase; ANR, anthocyanidin reductase.
