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