... tert-Butoxycarbonyl)-2,2-dimethyl-4-phenyl-5-oxazolidinecarboxylicacid;(4S,5R)-5-Carboxy-2,2-dimethyl-4-phenyl-3-(tert- ... butoxycarbonyl)oxazolidine;(4S,5R)-N-(tert-Butoxycarbonyl)-2,2-dimethyl-4-phenyl-5-oxazolidinecarboxylicacid ... ;(4S,5R)-N-(tert-butoxycarbonyl)-2,2-dimethyl-4-phenyl-5-oxazolidine ...