InChI=1S/C15H22O8/c1-9(7-5-3-2-4-6-8-16)22-15-12(19)10(17)11(18)13(23-15)14(20)21/h4-13,15,17-19H,2-3H2,1H3,(H,20,21)/b6-4+,7-5-