InChI=1/C13H14O9/c14-7-8(15)10(12(19)20)22-13(9(7)16)21-6-3-1-5(2-4-6)11(17)18/h1-4,7-10,13-16H,(H,17,18)(H,19,20)/t7-,8-,9+,10?,13-/s2