7-Azabicyclo[2.2.1]heptane-2-carboxylic acid,7-[[(1S,2S,4R)-7-[(1,1-dimethylethoxy)carbonyl]-7-azabicyclo[2.2.1]hept-2-yl]carbonyl]-, phenylmethyl ester, (1S,2S,4R)-