ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2%29O/file?format=sdf&get3d=True  -- CCCN%28CCC%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2%29O could not be loaded.