ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H7N5/c1-11-3-10-6-4(5(11)7)8-2-9-6/h2-3H,7H2,1H3/file?format=sdf&get3d=True  -- InChI=1S/C6H7N5/c1-11-3-10-6-4(5(11)7)8-2-9-6/h2-3H,7H2,1H3 could not be loaded.