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perfluorophenyl (2R,3aS,5R,5'R,6S,6''S,7aS)-6-methyl-6''-((pivaloyloxy)methyl)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-carboxylate
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methyl (E)-5-((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)-2-(phenylsulfonyl)pent-4-enoate
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((2R,3aS,5R,5'R,6S,6''S,7aS)-2-formyl-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl pivalate
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((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(hydroxymethyl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl pivalate