(S)-(-)-4-tert-Butyloxazolidine-2,5-dione (CAS No.62965-56-4), its synonyms are L-tert-Leucine N-carboxyanhydride ; (4S)-4-tert-Butyl-1,3-oxazolidine-2,5-dione ; 2,5-Oxazolidinedione, 4-(1,1-dimethylethyl)-, (4S)- .