ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1/C6H8N2/c7-5-2-1-3-6%288%294-5/h1-4H%2C7-8H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1/C6H8N2/c7-5-2-1-3-6%288%294-5/h1-4H%2C7-8H2 could not be loaded.