(1S,3R)-3-carbamoyl-2,2,3-trimethylcyclopentane-1-carboxylic acid

(+/-)-1,2,2-trimethyl-cis-3-carbamoylcyclopentanecarboxylic acid

(1R,3S)-3-aminocarbonyl-1,2,2-trimethylcyclopentane-1-carboxylic acid