ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H10N4/c1-8%282%294-3-6-7-5/h3-4H2%2C1-2H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C4H10N4/c1-8%282%294-3-6-7-5/h3-4H2%2C1-2H3 could not be loaded.