InChI=1S/C15H24O8/c1-3-9(7-5-4-6-8(2)16)22-15-12(19)10(17)11(18)13(23-15)14(20)21/h5,7,9-13,15,17-19H,3-4,6H2,1-2H3,(H,20,21)/b7-5+