((1S)-2-isopropylidene-5t-methyl-cyclopent-r-yl)-methanol

(Diethoxy-phosphoryl)-acetic acid (1R,2R)-2-methyl-5-oxo-cyclopentylmethyl ester

(4aS,7R,7aS)-(-)-7-methylhexahydrocyclopenta[c]pyran-3-one

(1R,5R)-1-Carboxymethyl-2-isopropylidene-5-methyl-cyclopentanecarboxylic acid methyl ester