L-valine p-nitrobenzyl ester

(5S)-5-propan-2-ylimidazolidine-2,4-dione

L-valine (6-methoxy-2-oxo-2H-naphtho[1,2-b]pyran-4-yl)methyl ester hydrobromide

(S)-(S)-2-amino-3-methylbutanoic phosphoric anhydride

L-valine (9-methoxy-3-thioxo-3H-benzo[f]benzopyran-1-yl)methyl ester hydrobromide