ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H3N5O2/c6-5-8-3-2(4(11)9-5)10(12)1-7-3/h1H,(H2,6,9,11)/file?format=sdf&get3d=True  -- InChI=1S/C5H3N5O2/c6-5-8-3-2(4(11)9-5)10(12)1-7-3/h1H,(H2,6,9,11) could not be loaded.