(15)N-(S)-O-succinimidyl-(2-(tert-butoxycarbonylamino)-3-methylbutyl)carbamate
(15)N-(S)-tert-butyl (3-methyl-1-(3-methylureido)butan-2-yl)carbamate
benzyl isothiocyanate
(15)N-2-tert-butoxycarbonyl-L-valinol
(15)N-(S)-tert-butyl(1-(1,3-dioxoisoindolin-2-yl)-3-methylbutan-2-yl)carbamate