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Liquid chromatography profiles (0–65 minutes) of oolong tea infusions and fresh tea leaves cultivated at altitudes of 200 m, 800 m, and 1300 m at 280 nm. Caffeine and the four major catechins, (−)-epicatechin (EC), (−)-epigallocatechin (EGC), (−)-EC gallate (ECG), and (−)-EGC gallate (EGCG) are indicated.
