ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N1CC%28OC1%28C%29C%29c2ccco2%29C%28Cl%29Cl/file?format=sdf&get3d=True  -- O%3DC%28N1CC%28OC1%28C%29C%29c2ccco2%29C%28Cl%29Cl could not be loaded.