Nα-(4-amino-4-deoxy-N10-methylpteroyl)-Nε-carbobenzoxy-L-lysine tert-butyl ester
Nα-pyroglutamyl-Nε-carbobenzoxy-Lys-O-t-Bu
tert-butyl Nα-[[4-N-(benzyloxycarbonyl)cytosin-1-yl]acetyl]-Nε-(benzyloxycarbonyl)-L-lysinate
tert-butyl Nα-[[6-N-(benzyloxycarbonyl)adenin-9-yl]acetyl]-Nε-(benzyloxycarbonyl)-L-lysinate
(S)-2-[3-((S)-(5-benzyloxycarbonylamino)-1-tert-butoxycarbonylpentyl)ureido]pentanedioic acid di-tert-butyl ester