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7-[[(3Ar,6S,7R,7aR)-6-ethenyl-6,7-dimethyl-2-oxo-3a,4,7,7a-tetrahydro-[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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