InChI=1/C16H16N2O3/c19-15(11-6-12-4-2-1-3-5-12)17-14-9-7-13(8-10-14)16(20)18-21/h1-5,7-10,21H,6,11H2,(H,17,19)(H,18,20)/f/h17-18H 2E8F3E36F6AAA0FE