InChI=1S/C21H26O4/c1-12(9-19-21(25-19)14(3)11-20(22)23)7-8-17-13(2)10-18(24-6)16(5)15(17)4/h7-11,19,21H,1-6H3,(H,22,23)/b8-7+,12-9+,14-11-