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(4S)-4alpha-[(1S,6S,8R)-6-[(1S)-1-(Tert-Butyldiphenylsiloxy)propyl]-10,10-dimethyl-5,9,11-trioxabicyclo[6.3.0]undeca-3-ene-4-yl]-5alpha-[(4-methoxyphenoxy)methyl]-1,3-dioxolane-2-one


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