(1S,5S,6S,8S,9R)-8-hydroxy-5,9-dimethylbicyclo<4.3.0>non-3-ene-2-one

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

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

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

(1S,5S,6S,9R)-5,9-dimethylbicyclo<4.3.0>non-3-ene-2,8-dione