InChI=1S/C22H21NO5/c1-22(2,27)18-11-14-9-12(3-8-17(14)28-18)10-16-19(21(26)23-20(16)25)13-4-6-15(24)7-5-13/h3-9,18,24,27H,10-11H2,1-2H3,(H,23,25,26)/t18-/m1/s1