InChI=1S/C22H21NO5/c1-22(2)18(25)11-14-9-12(3-8-17(14)28-22)10-16-19(21(27)23-20(16)26)13-4-6-15(24)7-5-13/h3-9,18,24-25H,10-11H2,1-2H3,(H,23,26,27)/t18-/m0/s1