ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c3c%28O/C%28%3DC1/OC%29c2ccc%28OC%29c%28O%29c2%29cc%28OC%29cc3O/file?format=sdf&get3d=True  -- O%3DC1c3c%28O/C%28%3DC1/OC%29c2ccc%28OC%29c%28O%29c2%29cc%28OC%29cc3O could not be loaded.