ERROR opening https://cactus.nci.nih.gov/chemical/structure/C/C%28CO%29%3DC%5CCCC2%28C%29C%28%3DC%29C1CC2CC1/file?format=sdf&get3d=True  -- C/C%28CO%29%3DC%5CCCC2%28C%29C%28%3DC%29C1CC2CC1 could not be loaded.