InChI=1S/C22H25NO4/c1-26-22(25)20-8-4-3-7-19(20)21(24)17-9-11-18(12-10-17)27-16-15-23-13-5-2-6-14-23/h3-4,7-12H,2,5-6,13-16H2,1H3