InChI=1S/C21H19NO6/c1-22(2)6-5-12-7-17-18(26-10-25-17)9-13(12)8-16-14-3-4-15-20(27-11-24-15)19(14)21(23)28-16/h3-4,7-9H,5-6,10-11H2,1-2H3/b16-8-