InChI=1S/C20H30O7/c1-10-5-6-17(24)16(4)8-14(22)27-20(17,15(10)23)19(26)12(3)13(11(2)9-21)7-18(16,19)25/h10-11,15,21,23-26H,5-9H2,1-4H3