InChI=1S/C19H19N.C4H6O6/c1-20-12-11-16-15-9-5-6-10-17(15)19(18(16)13-20)14-7-3-2-4-8-14;5-1(3(7)8)2(6)4(9)10/h2-10,19H,11-13H2,1H3;1-2,5-6H,(H,7,8)(H,9,10)