(RS)-ethoxy-(6-methyl-1-oxo-1,3-dihydro-isoindol-2-yl)-acetic acid 、
benzyl ((4-(aminomethyl)phenyl)(imino)methyl)carbamate 以to give (RS)-[1-amino-1-(4-{[2-ethoxy-2-(6-methyl-1-oxo-1,3-dihydro-isoindol-2-yl)-acetylamino]-methyl}-phenyl)-meth-(Z)-ylidene]-carbamic acid benzyl ester as light yellow foam, MS 515.5 ([M+H]+)的产率得到(RS)-[1-amino-1-(4-{[2-ethoxy-2-(6-methyl-1-oxo-1,3-dihydro-isoindol-2-yl)-acetylamino]-methyl}-phenyl)-meth-(Z)-ylidene]-carbamic acid benzyl ester