di-tert-butyl [(E)-(5,6-dioxo-5,6-dihydro-1'H-spiro[naphtho[1,2-b][1,4]oxathiine-2,4'-piperidine]-1'-yl)methylylidene]biscarbamate

N-[8-(4-benzyloxyphenoxy)-1-octyl]-2-(N',N''-bis-tert-butoxycarbonylguanidino)-3-phenylpropionamide

1-(4-benzyloxyphenoxy)-8-(2-N,N'-bis-tert-butoxycarbonylguanidino-3-phenyl-1-propyloxy)octane

16-amino-6-((tert-butoxycarbonyl)amino)-2,2-dimethyl-4,15-dioxo-3-oxa-5,7,14-triazaheptadec-5-en-17-oic acid