4-[2-(tert-butoxycarbonylamino)ethyl]-2-(trans-β-styryl)oxazole

tert-butyl (S)-(1-mercapto-4-(methylthio)butan-2-yl)carbamate

tert-butyl (R)-2-[(E)-prop-1-enylsulfanyl]-1-(ethoxycarbonyl)ethylcarbamate

benzyl (2R)-(tert-butoxycarbonyl)amino-4-hydroxybutanoate

tert-butyl methyl(3-methylbut-2-en-1-yl)carbamate