InChI=1S/C19H18O9/c1-10-17(26)19(28-16(25)9-7-14(22)23)12-5-3-2-4-11(12)18(10)27-15(24)8-6-13(20)21/h2-5,26H,6-9H2,1H3,(H,20,21)(H,22,23)