InChI=1S/C15H24O8/c1-2-3-4-5-6-8-9(22-8)7-21-15-12(18)10(16)11(17)13(23-15)14(19)20/h5-6,8-13,15-18H,2-4,7H2,1H3,(H,19,20)/b6-5+