InChI=1/C20H24O6/c1-25-18-6-11(3-4-16(18)23)20-14-8-17(24)19(26-2)7-12(14)5-13(9-21)15(20)10-22/h3-4,6-8,13,15,20-24H,5,9-10H2,1-2H3/t13-,15-,20-/s2