InChI=1S/C14H16N2O3/c17-12-11-7-4-8-16(11)13(18)14(19,15-12)9-10-5-2-1-3-6-10/h1-3,5-6,11,19H,4,7-9H2,(H,15,17)/t11-,14+/m1/s1