InChI=1S/C20H30O4/c1-18(2)6-5-7-20(4)15(18)8-13(22)12-9-19(3,16(24)11-21)10-14(23)17(12)20/h15-16,21,24H,5-11H2,1-4H3/t15?,16-,19?,20+/m1/s1