2,3,3-trimethyl-4-sulfo-cyclopent-1-enecarboxylic acid

5,5-dimethyl-3-oxo-cyclopent-1-enecarboxylic acid

2-methyl-propane-1,1,2-tricarboxylic acid

β-石竹烯

3,6,6-trimethylcyclohexadiene