InChI=1S/C21H26O4/c1-14(11-21(23)24)7-6-8-18(13-22)9-10-19-15(2)12-20(25-5)17(4)16(19)3/h6-12,22H,13H2,1-5H3,(H,23,24)/b7-6+,10-9+,14-11-,18-8-