ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cl/C%28Cl%29%3DC/C3C%28C%28%3DO%29OC%28C/file?format=sdf&get3d=True -- Cl/C%28Cl%29%3DC/C3C%28C%28%3DO%29OC%28C could not be loaded.