ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28%3DO%29C1%3DCC%28%3DC%28C%28%3DC1%29OC%29OC%29OC/file?format=sdf&get3d=True -- CCC%28%3DO%29C1%3DCC%28%3DC%28C%28%3DC1%29OC%29OC%29OC could not be loaded.