ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BK%2B%5D.C%3DC.Cl%5BPt-%5D%28Cl%29Cl.O/file?format=sdf&get3d=True  -- %5BK%2B%5D.C%3DC.Cl%5BPt-%5D%28Cl%29Cl.O could not be loaded.