InChI=1S/C15H26O8/c1-9(6-4-2-3-5-7-16)8-22-15-12(19)10(17)11(18)13(23-15)14(20)21/h6,10-13,15-19H,2-5,7-8H2,1H3,(H,20,21)/b9-6-