InChI=1S/C21H25NO6/c1-24-15-7-5-13(11-17(15)26-3)9-10-22-21(23)20-19(28-20)14-6-8-16(25-2)18(12-14)27-4/h5-8,11-12,19-20H,9-10H2,1-4H3,(H,22,23)