N-benzyl-2-formyloxy-3-formamidobutyric amide

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

2-[((S)-2-Acetylamino-3-phenyl-propionyl)-(3-methyl-butyl)-amino]-4-methyl-pentanoic acid (2-benzylcarbamoyl-2-hydroxy-1-methyl-ethyl)-amide

2-[((S)-2-Acetylamino-3-phenyl-propionyl)-benzyl-amino]-4-methyl-pentanoic acid (2-benzylcarbamoyl-2-hydroxy-1-methyl-ethyl)-amide

3-{2-[((S)-2-Acetylamino-3-phenyl-propionyl)-(3-methyl-butyl)-amino]-3-phenyl-propionylamino}-N-benzyl-2-hydroxy-butyramide