InChI=1S/C20H21NO5/c1-20(24,10-25-3)16-8-12-15(26-16)9-14(22)17-18(12)21(2)13-7-5-4-6-11(13)19(17)23/h4-7,9,16,22,24H,8,10H2,1-3H3