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7-[[(3Ar,6S,7S,7aR)-6-ethyl-7-methyl-2-oxo-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yl]oxy]-4-hydroxy-8-methyl-3-prop-1-en-2-ylchromen-2-one


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