InChI=1S/C18H30O8/c1-2-3-4-5-11-10(8-14(20)21)6-7-12(11)25-18-17(24)16(23)15(22)13(9-19)26-18/h3-4,10-13,15-19,22-24H,2,5-9H2,1H3,(H,20,21)/b4-3+