N,N'-bisbenzyloxycarbonyl-p-phenylenediamine
[4-(Benzyloxycarbonyl-{[(4-chloro-phenyl)-methyl-amino]-methyl}-amino)-phenyl]-carbamic acid benzyl ester
(4-{Benzyloxycarbonyl-[(methyl-p-tolyl-amino)-methyl]-amino}-phenyl)-carbamic acid benzyl ester
(4-{Benzyloxycarbonyl-[(methyl-phenyl-amino)-methyl]-amino}-phenyl)-carbamic acid benzyl ester
[4-(Benzyloxycarbonyl-{[(4-methoxy-phenyl)-methyl-amino]-methyl}-amino)-phenyl]-carbamic acid benzyl ester