3-pyrrolidinecarboxylic acid, 4-(1-methylethyl)-2-oxo-, ethyl ester InChI=1/C10H17NO3/c1-4-14-10(13)8-7(6(2)3)5-11-9(8)12/h6-8H,4-5H2,1-3H3,(H,11,12 ethyl 4-isopropyl-2-oxopyrrolidine-3-carboxylate