(3-Amino-propylamino)-acetic acid (S)-2-oxo-tetrahydro-furan-3-yl ester

(S)-2-{2-[tert-Butoxycarbonyl-(3-tert-butoxycarbonylamino-propyl)-amino]-acetoxy}-3-methyl-butyric acid methyl ester

(R)-3-{2-[tert-Butoxycarbonyl-(3-tert-butoxycarbonylamino-propyl)-amino]-acetoxy}-butyric acid ethyl ester

2-(3-Amino-propylamino)-N-[(R)-benzofuran-2-yl-(4-chloro-phenyl)-methyl]-acetamide

(R)-[2-(3-Amino-propylamino)-acetoxy]-phenyl-acetic acid methyl ester