5-dipropylamino-4(R)-benzamido-5-oxo-pentanoic acid
(S)-3-((R)-4-Benzyloxycarbonylamino-4-dipropylcarbamoyl-butyrylamino)-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid
(S)-3-((R)-4-Benzoylamino-4-dipropylcarbamoyl-butyrylamino)-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid
(R)-2-Amino-pentanedioic acid 5-[((S)-1-carbamoyl-2-phenyl-ethyl)-amide] 1-dipropylamide; hydrochloride
[(R)-3-((S)-1-Carbamoyl-2-phenyl-ethylcarbamoyl)-1-dipropylcarbamoyl-propyl]-carbamic acid benzyl ester