ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C7H6N4/c1-2-4-8-6(3-1)7-5-9-11-10-7/h1-5H,(H,9,10,11)/file?format=sdf&get3d=True  -- InChI=1S/C7H6N4/c1-2-4-8-6(3-1)7-5-9-11-10-7/h1-5H,(H,9,10,11) could not be loaded.