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(2007/10/02)5β-bromo-2,5,6,7,8,8a,9,9aβ-octahydro-8aβ-methyl-2-oxonaphtho<2,3-b>furan-3-carboxylic acid methyl ester
2,5-dihydro-4-methyl-5-<(1-methyl-2-oxocyclohexyl)methyl>-2-oxo-3-furancarboxylic acid methyl ester
2,4,4a,5,6,7,8,8a,9,9a-decahydro-4aβ-hydroxy-8aβ-methyl-2-oxonaphtho<2,3-b>furan-3-carboxylic acid methyl ester
5β-bromo-2,3,3aβ,5,6,7,8,8a,9,9aβ-decahydro-8aβ-methyl-2-oxonaphtho<2,3-b>furan-3-carboxylic acid methyl ester
2,5,6,7,8,8a,9,9aβ-octahydro-8aβ-methyl-2-oxonaphtho<2,3-b>furan-3-carboxylic acid methyl ester