1-(tert-Butyl) 1'-ethyl 4'-(aminomethyl)-3'-oxaspiro[azetidine-3,2'-bicyclo[2.1.1]hexane]-1,1'-dicarboxylate 1g

1-(tert-Butyl) 1'-ethyl 4'-(aminomethyl)-3'-oxaspiro[azetidine-3,2'-bicyclo[2.1.1]hexane]-1,1'-dicarboxylate 1g