InChI=1S/C18H14O7/c19-6-3-8-12(10(20)4-6)16(22)14-9(15(8)21)5-11-13(17(14)23)7-1-2-24-18(7)25-11/h1-2,5-7,18-19,21-23H,3-4H2/t6-,7+,18-/m1/s1