ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1N%28C%28%3DO%29CC1%29CC4CCC3N%28CCN%28c2ncccn2%29C3%29C4/file?format=sdf&get3d=True  -- O%3DC1N%28C%28%3DO%29CC1%29CC4CCC3N%28CCN%28c2ncccn2%29C3%29C4 could not be loaded.