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While only the (ai| grid directly affects the MP2 energy, the relative sizes of the other grids are examined.Vescalagin (1) is a major ellagitannin from young spring leaves of Quercus glauca; however, the amount of 1 decreases as the leaves mature with a concomitant rise in the levels of catechin (3) and procyanidins. In this report, the chemical mechanism responsible for the degradation of 1 was investigated. In vitro model experiments indicated that initially a polyphenol oxidase oxidizes the catechin B-ring, and the resulting catechin