InChI=1S/C18H16O6/c1-20-12-6-4-3-5-10(12)13-7-11(19)16-14(24-13)8-15-17(18(16)21-2)23-9-22-15/h3-6,8,13H,7,9H2,1-2H3/t13-/m0/s1