InChI=1S/C15H16O9/c16-8-5-4-6-2-1-3-7(12(6)23-8)22-15-11(19)9(17)10(18)13(24-15)14(20)21/h1-3,9-11,13,15,17-19H,4-5H2,(H,20,21)