ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H16N2O2/c19-15(17-11-13-7-3-1-4-8-13)16(20)18-12-14-9-5-2-6-10-14/h1-10H,11-12H2,(H,17,19)(H,18,20)/file?format=sdf&get3d=True  -- InChI=1S/C16H16N2O2/c19-15(17-11-13-7-3-1-4-8-13)16(20)18-12-14-9-5-2-6-10-14/h1-10H,11-12H2,(H,17,19)(H,18,20) could not be loaded.