1-pyrrolidinecarboxylic acid, 2-oxo-, 1,1-dimethylethyl ester InChI=1/C9H15NO3/c1-9(2,3)13-8(12)10-6-4-5-7(10)11/h4-6H2,1-3H tert-butyl 2-oxopyrrolidine-1-carboxylate