ERROR opening https://cactus.nci.nih.gov/chemical/structure/C/C%28CO%29%3DC%5CCCC3%28C%29C1CC2C%28C1%29C23C/file?format=sdf&get3d=True  -- C/C%28CO%29%3DC%5CCCC3%28C%29C1CC2C%28C1%29C23C could not be loaded.