InChI=1S/C21H26O4/c1-14(7-6-8-15(2)11-21(23)24)9-10-18-16(3)12-20(25-5)19(13-22)17(18)4/h6-12,22H,13H2,1-5H3,(H,23,24)/b8-6+,10-9+,14-7+,15-11-