ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5CC1%3DC%5CCC%28CC1%29C%28O%29%28C%29C/file?format=sdf&get3d=True -- C%5CC1%3DC%5CCC%28CC1%29C%28O%29%28C%29C could not be loaded.