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