ERROR opening https://cactus.nci.nih.gov/chemical/structure/O1%5CC%3DC/%5CC%3DC/C1+O1%5CC%3DC/C%5CC%3DC/1/file?format=sdf&get3d=True -- O1%5CC%3DC/%5CC%3DC/C1+O1%5CC%3DC/C%5CC%3DC/1 could not be loaded.