ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%26%2361%3B1S/CH2N4/c1-2-4-5-3-1/h1H%2C%28H%2C2%2C3%2C4%2C5%29/file?format=sdf&get3d=True  -- InChI%3DInChI%26%2361%3B1S/CH2N4/c1-2-4-5-3-1/h1H%2C%28H%2C2%2C3%2C4%2C5%29 could not be loaded.