InChI=1S/C22H31NO4/c1-18(16-24)15-23-22(25)11-9-7-5-3-2-4-6-8-10-19-12-13-20-21(14-19)27-17-26-20/h5,7-8,10,12-14,18,24H,2-4,6,9,11,15-17H2,1H3,(H,23,25)/b7-5+,10-8+