InChI=1S/C21H28O4/c1-13(8-7-9-14(2)20(22)21(23)24)10-11-18-15(3)12-19(25-6)17(5)16(18)4/h7-12,14,20,22H,1-6H3,(H,23,24)/b9-7+,11-10+,13-8+