Pulegenic acid

(1S)-2α-Methyl-5-isopropylidenecyclopentanecarboxylic acid

(1S)-2-Isopropylidene-5β-methylcyclopentane-1α-carboxylic acid

(1S,2R)-2-Methyl-5-(1-methylethylidene)cyclopentanecarboxylic acid