InChI=1S/C21H32O4/c1-4-21(25)11-16(23)18-14-6-5-12-9-13(22)10-17(24)20(12,3)15(14)7-8-19(18,21)2/h10,12,14-16,18,22-23,25H,4-9,11H2,1-3H3/t12?,14-,15+,16?,18-,19+,20+,21-/m1/s1