ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H4N4O3/c11-2-1-7-4-3(8-2)5(12)10-6(13)9-4/h1H,(H,8,11)(H2,7,9,10,12,13)/file?format=sdf&get3d=True  -- InChI=1S/C6H4N4O3/c11-2-1-7-4-3(8-2)5(12)10-6(13)9-4/h1H,(H,8,11)(H2,7,9,10,12,13) could not be loaded.