InChI=1S/C18H14O6/c19-17(20)6-3-10-1-4-13-12(18(10)21)8-15(24-13)11-2-5-14-16(7-11)23-9-22-14/h1-2,4-5,7-8,21H,3,6,9H2,(H,19,20)