ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%26%2361%3B1S/C2F4/c3-1%284%292%285%296/file?format=sdf&get3d=True  -- InChI%3DInChI%26%2361%3B1S/C2F4/c3-1%284%292%285%296 could not be loaded.