InChI=1S/C20H22O4/c1-14(2)6-5-7-15(3)12-13-23-17-10-8-16-9-11-18(21)24-19(16)20(17)22-4/h5-6,8-12H,1,7,13H2,2-4H3/b6-5+,15-12+