InChI=1S/C21H21NO6/c1-24-20-17-12(6-16-19(20)28-11-26-16)4-5-22-8-14-13(7-21(17,22)9-23)2-3-15-18(14)27-10-25-15/h2-3,6,23H,4-5,7-11H2,1H3/t21-/m1/s1