ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%3DCCC%28C%29%28CC%28%3DC%29C1%3DCC%3DC%28O%29C%3DC1%29C%3DC/file?format=sdf&get3d=True -- CC%28C%29%3DCCC%28C%29%28CC%28%3DC%29C1%3DCC%3DC%28O%29C%3DC1%29C%3DC could not be loaded.