3-(2-Hydroxy-2-methyl-propionyl)-2,2-dimethyl-cyclopropanecarboxylic acid

(+-)-3t-isobutyryl-2,2-dimethyl-cyclopropane-r-carboxylic acid

2,4,6-trimethyl-benzenesulfonic acid 3,3,6,6-tetramethyl-4-oxo-bicyclo[3.1.0]hex-2-yl ester

4-Isopropylidene-6,6-dimethyl-3-oxa-bicyclo[3.1.0]hexan-2-one

4-hydroxy-3,3,6,6-tetramethyl-1-trimethylsilanyl-bicyclo[3.1.0]hexan-2-one