(6R)-9-[(2-methylpropan-2-yl)oxycarbonyl]-9-azabicyclo[4.2.1]non-4-ene-5-carboxylic acid

tert-butyl (6R)-5-(1,2-oxazolidine-2-carbonyl)-9-azabicyclo[4.2.1]non-4-ene-9-carboxylate