InChI=1S/C20H19NO5/c1-9(22)20(21)7-6-12-13(8-20)19(26)15-14(18(12)25)16(23)10-4-2-3-5-11(10)17(15)24/h2-5,9,22,25-26H,6-8,21H2,1H3/t9?,20-/m1/s1