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{4-[((S)-2-amino-propionyl)-isopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

{2-[((S)-2-amino-propionyl)-isopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

[(2-Tert-butoxycarbonylamino-cyclohexyl)-methyl-amino]-acetic acid

[4-(2-Amino-acetylamino)-cyclohexyl]-carbamic acid tert-butyl ester

[4-((S)-2-amino-3-methyl-butyrylamino)-cyclohexyl]-carbamic acid tert-butyl ester

{4-[((S)-2-amino-3-methyl-butyryl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

[(4-Tert-butoxycarbonylamino-cyclohexyl)-methyl-amino]-acetic acid

{4-[((S)-2-amino-propionyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

{2-[((S)-2-amino-propionyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

(4-Benzyloxycarbonylamino-cyclohexylamino)-acetic acid