InChI=1S/C16H12O6/c1-6-11-13(16-9(21-6)5-10(18)22-16)14(19)7-3-2-4-8(17)12(7)15(11)20/h2-4,6,9,16-17H,5H2,1H3/t6-,9-,16-/m0/s1