(1R,2R,3R,5R)-2-Amino-6,6-dimethylbicyclo[3.1.1]heptan-3-carboxylic acid hydrochloride(1R,2R,3R,5R)-2-Amino-6,6-dimethylbicyclo[3.1.1]heptan-3-carboxylic acid hydrochloride