(S)-2-{[(S)-2-((R)-2-{2-[((S)-2-{(S)-2-[((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-3-phenyl-propionylamino}-octanoyl)-methyl-amino]-acetoxy}-propionylamino)-octanoyl]-methyl-amino}-4-methyl-pentanoic acid tert-butyl ester

(3S)-[1-(2-azidobenzoyl)]-3,4-dihydro-4-methyl-3-phenylmethyl-[1,4]benzodiazepin-2,5(1H)-dione

(S)-2-[((2S,4R)-2-{(S)-2-[((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-3-phenyl-propionylamino}-4-methyl-octanoyl)-methyl-amino]-propionic acid methyl ester

(S)-2-Amino-N-{(R)-1-[({[(S)-1-benzyl-2-oxo-2-(N'-propionyl-hydrazino)-ethyl]-methyl-carbamoyl}-methyl)-carbamoyl]-ethyl}-3-(4-hydroxy-phenyl)-propionamide

(S)-N-{(R)-1-[({[(S)-1-Benzyl-2-oxo-2-(N'-propionyl-hydrazino)-ethyl]-methyl-carbamoyl}-methyl)-carbamoyl]-ethyl}-3-(4-hydroxy-phenyl)-2-methylamino-propionamide