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7-[[(3Ar,6S,7R,7aR)-6-ethyl-7-methoxy-6-methyl-2-oxo-3a,4,7,7a-tetrahydro-[1,3]dioxolo[4,5-c]pyran-4-yl]oxy]-3-acetyl-4-hydroxy-8-methylchromen-2-one


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