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