N-{4-[3-(2,3-Bis-benzyloxy-benzoylamino)-propylamino]-butyl}-2-({4-[3-(2,3-bis-benzyloxy-benzoylamino)-propylamino]-butylcarbamoyl}-methyl)-2-hydroxy-succinamic acid tert-butyl ester

N-{4-[4-(2,3-Bis-benzyloxy-benzoylamino)-butylamino]-butyl}-2-({4-[4-(2,3-bis-benzyloxy-benzoylamino)-butylamino]-butylcarbamoyl}-methyl)-2-hydroxy-succinamic acid tert-butyl ester

N-(4-{[4-(2,3-Bis-benzyloxy-benzoylamino)-butyl]-tert-butoxycarbonyl-amino}-butyl)-2-[(4-{[4-(2,3-bis-benzyloxy-benzoylamino)-butyl]-tert-butoxycarbonyl-amino}-butylcarbamoyl)-methyl]-2-hydroxy-succinamic acid tert-butyl ester

ethyl 2,3-bis(benzyloxy)benzimidate

2-benzyloxy-6-benzyloxycarbonylphenyl 2,6-dibenzyloxy-4-benzyloxycarbonylphenyl ketone