X (4R-Cis)-6-[(acetyloxy)methyl]-2.2-dimethyl-1.3-dioxane-4-acetic acid.1.1-dimethylethyl ester, , , , X (4R-Cis)-6-[(acetyloxy)methyl]-2.2-dimethyl-1.3-dioxane-4-acetic acid.1.1-dimethylethyl ester,
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