ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1NC%28%3DO%29NC%28%3DO%29C1%28CCC%28C%29C%29CC/file?format=sdf&get3d=True  -- O%3DC1NC%28%3DO%29NC%28%3DO%29C1%28CCC%28C%29C%29CC could not be loaded.