InChI=1/C16H12O5/c17-11(9-15(19)16(20)21)8-14(18)13-7-3-5-10-4-1-2-6-12(10)13/h1-8,18H,9H2,(H,20,21)/p-2/b14-8+/fC16H10O5/h18h/q-2 AC9D27FC454FA923