InChI=1S/C15H26O8/c1-8(7-16)5-3-4-6-9(2)22-15-12(19)10(17)11(18)13(23-15)14(20)21/h5,9-13,15-19H,3-4,6-7H2,1-2H3,(H,20,21)/b8-5-