ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%28CC%29C%29C2%28c1ccccc1%29CCN%28CCCCCC%29CC2/file?format=sdf&get3d=True  -- O%3DC%28N%28CC%29C%29C2%28c1ccccc1%29CCN%28CCCCCC%29CC2 could not be loaded.