ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C3H6N4O2/c4-2(8)6-1-7-3(5)9/h1H,(H5,4,5,6,7,8,9)/file?format=sdf&get3d=True  -- InChI=1S/C3H6N4O2/c4-2(8)6-1-7-3(5)9/h1H,(H5,4,5,6,7,8,9) could not be loaded.