ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29C1CC2%3DC3C%28%3DCNC3%3DCC%3DC2%29C1/file?format=sdf&get3d=True  -- CCCN%28CCC%29C1CC2%3DC3C%28%3DCNC3%3DCC%3DC2%29C1 could not be loaded.