ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC3c1c%28cccc1%29N%28c2c%28cccc2%29C3%29CCCN%28C%29C/file?format=sdf&get3d=True  -- O%3DC3c1c%28cccc1%29N%28c2c%28cccc2%29C3%29CCCN%28C%29C could not be loaded.