(2S)-8-tert-butoxy-8-oxo-2-[(2-thienylcarbonyl)amino]octanoic acid 、
2-(2-苯基-1H-吲哚-3-基)-乙胺 以the desired material (E5) was isolated by reverse phase prep的产率得到tert-butyl (7S)-8-oxo-8-{[2-(2-phenyl-l1H-indol-3-yl)ethyl]amino}-7-[(2-thienylcarbonyl)amino]octanoate