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(1R,5S)-8-methoxy-3,3-dimethyl-2,4-dioxabicyclo-[3.3.0]oct-7en-6-one
→
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(3aR,6aR)-6-((methoxymethoxy)methyl)-2,2-dimethyl-3aH-cyclopenta[d][1,3]dioxol-4(6aH)-one
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(-)-Neplanocin A