InChI=1/C10H15NO4/c1-7(2)15-10(14)8-3-4-9(13)11(8)5-6-12/h6-8H,3-5H2,1-2H isopropyl 5-oxo-1-(2-oxoethyl)prolinate proline, 5-oxo-1-(2-oxoethyl)-, 1-methylethyl ester