InChI=1S/C19H28O9/c1-10-6-12(22)7-18(2,3)19(10,26)5-4-11(21)9-27-17-16(25)15(24)14(23)13(8-20)28-17/h4-6,13-17,20,23-26H,7-9H2,1-3H3/b5-4+