InChI=1S/C21H22O5/c1-13(2)19(24)12-17-20(26-3)11-9-16(21(17)25)18(23)10-6-14-4-7-15(22)8-5-14/h4-11,19,22,24-25H,1,12H2,2-3H3/b10-6+