InChI=1S/C19H16O5/c1-11(20)17(21)15(12-7-3-2-4-8-12)16-18(22)13-9-5-6-10-14(13)24-19(16)23/h2-10,15,17,21-22H,1H3/t15-,17-/m1/s1