Home(1R,2R,3S,5R)-(2-tert-Butoxycarbonylamino)-6,6-dimethylbicyclo[3.1.1]heptan-3-carboxylic acid(1R,2R,3S,5R)-(2-tert-Butoxycarbonylamino)-6,6-dimethylbicyclo[3.1.1]heptan-3-carboxylic acid