ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2c1ccccc1C%28%3DO%29C2C%28%3DO%29C%28C%29%28C%29C/file?format=sdf&get3d=True -- O%3DC2c1ccccc1C%28%3DO%29C2C%28%3DO%29C%28C%29%28C%29C could not be loaded.