ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29c2c%28Nc1cccc%28c1C%29C%29cccc2/file?format=sdf&get3d=True  -- O%3DC%28O%29c2c%28Nc1cccc%28c1C%29C%29cccc2 could not be loaded.