diphenyl 1-(benzyloxycarbonylamino)-2-{4-[N,N'-bis(tert-butyloxycarbonyl)guanidino]phenyl}ethanephosphonate

diphenyl 1-amino-2-(4-(N,N'-bis(tert-butyloxycarbonyl)guanidino)phenyl)ethyl-phosphonate

[(N-o,o-dimethylbenzoyl-O-tert-butyl)-D-seryl]-L-alanine

4-(tert-butyloxycarbonylamino)phenylacetaldehyde