ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/3CN.Au/c3%2A1-2%3B/q3%2A-1%3B%2B3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/3CN.Au/c3%2A1-2%3B/q3%2A-1%3B%2B3 could not be loaded.