N-cyclohexyl-2-hydroxy-3-aminobutyric amide

Formic acid 1-cyclohexylcarbamoyl-2-isocyano-propyl ester

N-cyclohexyl-2-formyloxy-3-formamidobutyric amide

2-[(2-Acetylamino-acetyl)-(3-methyl-butyl)-amino]-4-methyl-pentanoic acid (2-cyclohexylcarbamoyl-2-hydroxy-1-methyl-ethyl)-amide

3-{2-[(2-Acetylamino-acetyl)-(3-methyl-butyl)-amino]-3-phenyl-propionylamino}-N-cyclohexyl-2-hydroxy-butyramide