InChI=1S/C19H31NO.C4H4O4/c1-20(2)15-10-16-21-19(13-8-3-4-9-14-19)17-18-11-6-5-7-12-18;5-3(6)1-2-4(7)8/h5-7,11-12H,3-4,8-10,13-17H2,1-2H3;1-2H,(H,5,6)(H,7,8)/b;2-1+