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(4R)-4alpha-[3-[(4S)-2,2-Dimethyl-5beta-[(2S,3S)-2-hydroxy-3-(tert-butyldiphenylsiloxy)pentyl]-1,3-dioxolane-4beta-yl]-1-propynyl]-5alpha-[(4-methoxyphenoxy)methyl]-1,3-dioxolane-2-one


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