N-cyclooctyl-γ-tert-butyl-L-glutamic acid 、 (2S)-1-tert-butoxycarbonyl-2(2-(1-allyloxycarbonylamino-isoquinolin-6-oxy)ethyl)-piperidine 以providing 380 mg (58%) of the title compound as a colourless oil的产率得到1-(N-cyclooctyl-γ-tert-butyl-L-glutamyl)-2-(2-(1-allyloxycarbonylamino-isoquinolin-6-oxy)-ethyl)-piperidine