InChI=1S/C21H34N2O4/c1-19(2,22)23-18(24)12-13-3-5-20(6-4-13)25-21(27-26-20)16-8-14-7-15(10-16)11-17(21)9-14/h13-17H,3-12,22H2,1-2H3,(H,23,24)/t13-,14?,15?,16-,17+,20+,21?