exo-7-tert-butoxycarbonyl-5,5-difluoro-7-azabicyclo[2.2.1]heptane-2-carboxylic acid CAS:1290627-12-1 EXO-TERT-BUTYL 6-(METHOXY(METHYL)CARBAMOYL)-3-AZABICYCLO[3.1.0]HEXANE-3-CARBOXYLATE CAS:2226338-58-3 | ||||||||||||