15260-10-3 Butyric acid, 3-(benzyloxy)-2-(carboxyamino)-, N-tert-butyl ester, Ls-threo- L-Threonine, N-[(1,1-dimethylethoxy)carbonyl]-O-(phenylmethyl)- N-[(1,1-Dimethylethoxy)carbonyl]-O-(phenylmethyl)-L-threonine NSC334365