(6R,7S,8R)-8-Isopropenyl-6-methyl-1,4-dioxa-spiro[4.4]nonane-7-carboxylic acid

(6R,7S,8S)-6-Methyl-8-((R)-1-methyl-2-oxo-ethyl)-1,4-dioxa-spiro[4.4]nonane-7-carboxylic acid

(6R,7S,8S)-8-((R)-2-Hydroxy-1-methyl-ethyl)-6-methyl-1,4-dioxa-spiro[4.4]nonane-7-carboxylic acid

2-Diazo-1-((6R,7S,8R)-8-isopropenyl-6-methyl-1,4-dioxa-spiro[4.4]non-7-yl)-ethanone

(6R,7S,8S)-8-((R)-2-Hydroxy-1-methyl-ethyl)-6-methyl-1,4-dioxa-spiro[4.4]nonane-7-carboxylic acid methyl ester

[(6R,7S,8R)-8-((S)-1-Hydroxy-ethyl)-6-methyl-1,4-dioxa-spiro[4.4]non-7-yl]-carbamic acid benzyl ester

(1S,2R,5S)-5-((R)-2-Hydroxy-1-methyl-ethyl)-2-methyl-3-oxo-cyclopentanecarboxylic acid methyl ester

(3'R,3'aS,7'S,7'aS)-3',7'-Dimethyl-3',3'a,7',7'a-tetrahydro-1'H-spiro[[1,3]dioxolane-2,2'-inden]-4'-one

(1S,2R,5S)-5-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-2-methyl-3-oxo-cyclopentanecarboxylic acid methyl ester

(3S,4S)-3-acetyl-4-<1(R)-(methoxycarbonyl)ethyl>azetidin-2-one

(1S,2R,3S,5S)-5-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-3-hydroxy-2-methyl-cyclopentanecarboxylic acid methyl ester

(1S,5S)-5-((R)-2-Hydroxy-1-methyl-ethyl)-2-methyl-cyclopent-2-enecarboxylic acid ethyl ester

(3'R,3'aS,7'R,7'aS)-5',6'-Dihydroxy-3',7'-dimethyl-hexahydro-spiro[[1,3]dioxolane-2,2'-inden]-4'-one