2-(indol-3-yl-acetyl)-7,7-dimethoxy-2-aza-bicyclo[2.2.2]octan-6-one

benzyl 7,7-dimethoxy-6-oxo-2-azabicyclo<2.2.2>octane-2-carboxylate

benzyl 3-hydroxy-4-oxa-9-azatricyclo<5.3.1.03,8>undecane-9-carboxylate