InChI=1S/C21H21NO7/c1-22(2)6-5-12-8-17-18(28-10-27-17)9-13(12)7-15(23)14-3-4-16-20(29-11-26-16)19(14)21(24)25/h3-4,8-9H,5-7,10-11H2,1-2H3,(H,24,25)