InChI=1S/C22H23NO4/c1-14(2)11-16(24)12-15(3)7-9-26-17-5-6-18-20(13-17)23-22-19(8-10-27-22)21(18)25-4/h5-6,8,10-13H,7,9H2,1-4H3/b15-12+