[1-(Tert-butoxycarbonylamino-methyl)-6,7-dimethoxy-isoquinolin-4-yl]-acetic acid   、                                                                                      
N-乙基苄胺                                                                                                                                                                                                                                                                                                          以to give 84 mg of {4-[(Benzyl-ethyl-carbamoyl)-methyl]-6,7-dimethoxy-isoquinolin-1-ylmethyl}-carbamic acid tert-butyl ester的产率得到{4-[(benzyl-ethyl-carbamoyl)-methyl]-6,7-dimethoxy-isoquinolin-1-ylmethyl}-carbamic acid tert-butyl ester