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(5S,8S,9S,10S,E)-5,8,9-tris(4-methoxybenzyloxy)-10-methyl-3,4,5,8,9,10-hexahydro-2H-oxecin-2-one
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(5S,8S,9R,10S,E)-5,8,9-trihydroxy-10-methyl-3,4,5,8,9,10-hexahydro-2H-oxecin-2-one
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(5S,8S,9S,10S,E)-5,8-bis((tert-butyldimethylsilyl)oxy)-9-hydroxy-10-methyl-3,4,5,8,9,10-hexahydro-2H-oxecin-2-one