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