benzyl ((S)-1-(((S)-1-(5-(2-methoxyphenyl)thiazol-2-yl)-1-oxo-3-((S)-2-oxopyrrolidin-3-yl)propan-2-yl)amino)-4-methyl-1-oxopentan-2-yl)carbamate

benzyl ((S)-1-(((S)-1-(benzo[d]thiazol-2-yl)-1-oxo-3-((S)-2-oxopyrrolidin-3-yl)propan-2-yl)amino)-4-methyl-1-oxopentan-2-yl)carbamate

(S)-tert-butyl 4-methyl-2-(pyrrolidin-1-yl)pentanoate

(S,E)-tert-butyl 4-methyl-2-(pyrrolidin-1-yl)-2-(2-(p-tosyl)vinyl)pentanoate