ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCC%29c1c%28c2c%28nc1C%29n%28nc2%29CC%29NCCCC/file?format=sdf&get3d=True  -- O%3DC%28OCC%29c1c%28c2c%28nc1C%29n%28nc2%29CC%29NCCCC could not be loaded.