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