ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H6N4O2/c10-4-7-3-6-1-2-9(3)5(11)8-4/h1-2H2,(H2,6,7,8,10,11)/file?format=sdf&get3d=True  -- InChI=1S/C5H6N4O2/c10-4-7-3-6-1-2-9(3)5(11)8-4/h1-2H2,(H2,6,7,8,10,11) could not be loaded.