InChI=1S/C18H21NO4/c1-23-17-12-14(4-8-16(17)21)5-9-18(22)19-11-10-13-2-6-15(20)7-3-13/h2-4,6-8,12,20-21H,5,9-11H2,1H3,(H,19,22)