InChI=1S/C15H22O8/c1-3-4-5-6-7-8(2)14(21)23-15-11(18)9(16)10(17)12(22-15)13(19)20/h3,7,9-12,15-18H,1,4-6H2,2H3,(H,19,20)/b8-7-