ERROR opening https://cactus.nci.nih.gov/chemical/structure/c12c%28cccc1%29CC3N%28CCC2%28C3C%29C%29CC4CC4/file?format=sdf&get3d=True  -- c12c%28cccc1%29CC3N%28CCC2%28C3C%29C%29CC4CC4 could not be loaded.