ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1/C%3DC%5CCC/C%3DC%5CC1.Cl%5BPt%5DCl/file?format=sdf&get3d=True  -- C1/C%3DC%5CCC/C%3DC%5CC1.Cl%5BPt%5DCl could not be loaded.