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Aphagranols A (1) and B (2), a pair of isomers with a novel limonoid carbon skeleton, were isolated from the fruits of Aphanamixis grandifolia. Their structures were determined by spectroscopic analyses and further confirmed by their unique acetylated derivative aphagranol C (3). The possible equilibrium system of the enol interconversion was presented using the polarizable continuum model (PCM)....
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