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Methyl (4R,5R)-5-[(2S)-butan-2-yl]-4-[(E,7E)-7-hydroxy-7-[(6R)-6-methyl-2,4-dioxooxan-3-ylidene]-4-methylidenehept-1-enyl]-2-oxo-1,3-dioxolane-4-carboxylate


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