3-((R)-1-Methyl-2-oxo-cyclopentyl)-benzoic acid methyl ester

3-((R)-6-Methyl-1,4-dioxa-spiro[4.4]non-6-yl)-cyclohexa-1,4-dienecarboxylic acid methyl ester

3-((R)-6-Methyl-1,4-dioxa-spiro[4.4]non-6-yl)-benzoic acid methyl ester