InChI=1S/C21H30O4/c1-13(8-9-18(22)23)7-6-11-21(5)12-10-17-16(4)19(24)14(2)15(3)20(17)25-21/h7,24H,6,8-12H2,1-5H3,(H,22,23)/b13-7+/t21-/m1/s1