4-Pentenoic acid, 2-amino-, methyl ester, (2S)-

(2S,4'S,5'R)-2-amino-1-(3',4'-dimethyl-2'-oxo-5'-phenyl-1'-imidazolydinyl)-4-penten-1-one

((2R,3R)-3-allyloxiran-2-yl)methanol

(2S)-2-[tert-butoxycarbonyl-(4-methoxybenzyl)amino]-4-pentenoic acid