InChI=1S/C21H27NO4/c1-14(23)22(2,3)12-11-16-7-10-19(25)21(26-4)20(16)18(22)13-15-5-8-17(24)9-6-15/h5-10,18,24-25H,11-13H2,1-4H3/q+1