ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cl.Cl%26%2391%3BAu%26%2393%3B%28Cl%29Cl/file?format=sdf&get3d=True -- Cl.Cl%26%2391%3BAu%26%2393%3B%28Cl%29Cl could not be loaded.