ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC/1/C%3DC%5CC%28%3DO%29%5CC%3DC%5C1COC%28%3DO%29CC%28C%29C/file?format=sdf&get3d=True -- O%3DC/1/C%3DC%5CC%28%3DO%29%5CC%3DC%5C1COC%28%3DO%29CC%28C%29C could not be loaded.