(S)-7-((S)-2-methoxycarbonylamino-3-methyl-butyryl)-1,4-dioxa-7-aza-spiro[4.4]nonane-8-carboxylic acid methyl ester
(S)-1-((S)-2-methoxycarbonylamino-3-methyl-butyryl)-4-oxo-pyrrolidine-2-carboxylic acid methyl ester
(2S,4R)-4-Hydroxy-1-((S)-2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidine-2-carboxylic acid methyl ester
(S)-7-((S)-2-((methoxycarbonyl)amino)-3-methylbutanoyl)-1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylic acid
4-Bromo-benzene-1,2-diamine