4-{[(3-{8-[2-(6,6-Dimethyl-bicyclo(3.1.1]hept-2-yl)-ethyl]-4-oxo-1-phenyl-1,3,8-triaza-spiro[4.5]dec-3-yl} propyl)-methyl-amino]-methyl}-4-hydroxy-piperidine-1-carboxylic Acid Tert-Butyl Ester