2,5-Diazabicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl esterN-(tert-Butoxycarbonyl)-2,5-diazabicyclo[2.2.1]heptane(1S,4S)-2-Boc-2,5-二氮双环[2.2.1]庚烷tert-Butyl (1S,4S)-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate(1S,4S)-(-)-2-Boc-2,5-diazabicyclo[2.2.1]heptaneN-BOC-2,5-DIAZA-BICYCLO[2.2.1]HEPTANE