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Catechins belong to the category of flavanols, which have two isomeric forms, a positive (+) form and a negative (−) form (epicatechin). The (+)-catechins have antioxidative properties, whereas the (−)-epicatechins act as pro-oxidants inducing oxidative effects.
(−)-epicatechins Examples: EGCG, EGC, GCG GC ECTG, EC (all found in green tea, and maybe dark chocolate)