InChI=1S/C21H19NO6/c1-25-15-4-3-12-14(21(15)26-2)9-18(23)22-6-5-11-7-16-17(28-10-27-16)8-13(11)20(24)19(12)22/h3-4,7-8,19H,5-6,9-10H2,1-2H3/t19-/m1/s1