InChI=1S/C21H26O4/c1-13(8-7-9-14(2)12-19(22)23)10-11-18-15(3)16(4)21(25-6)20(24)17(18)5/h7-12,24H,1-6H3,(H,22,23)/b9-7+,11-10+,13-8+,14-12-