ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H5N3O2/c1-9-4(8)3-2-5-7-6-3/h2H,1H3,(H,5,6,7)/file?format=sdf&get3d=True  -- InChI=1S/C4H5N3O2/c1-9-4(8)3-2-5-7-6-3/h2H,1H3,(H,5,6,7) could not be loaded.