InChI=1S/C15H22O8/c1-2-3-4-5-6-7-8-9(16)22-15-12(19)10(17)11(18)13(23-15)14(20)21/h3-4,7-8,10-13,15,17-19H,2,5-6H2,1H3,(H,20,21)/b4-3-,8-7+