InChI=1/C20H23NO4/c1-21(2)12-13-5-7-15(8-6-13)25-19-10-14-9-17(23-3)18(24-4)11-16(14)20(19)22/h5-9,11,19H,10,12H2,1-4H3/p+1/t19-/m0/s1/fC20H24NO4/h21H/q+1 F18B22ED1571716E