| 4-(((phenylamino)carbonyl)amino)-1-(phenylmethyl)-4-piperidinecarboxylic aci |
| benzyl-1 (phenyl-3' ureido-1')-4 isonipecotate d' ethyle |
| ethyl 4-(((phenylamino)carbonyl)amino)-1-(phenylmethyl)-4-piperidinecarboxyla |
| 4-(((phenylamino)carbonyl)amino)-1-(phenylmethyl)-4-piperidinecarboxylic aci ethyl ester |
