InChI=1S/C21H27NO4/c1-2-13-22-14-18(24)15-26-21-6-4-3-5-19(21)20(25)12-9-16-7-10-17(23)11-8-16/h3-8,10-11,18,22-24H,2,9,12-15H2,1H3/t18-/m0/s1