ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CNCC2%3DC1C%3DCC%28%3DC2Cl%29Cl.Cl/file?format=sdf&get3d=True  -- C1CNCC2%3DC1C%3DCC%28%3DC2Cl%29Cl.Cl could not be loaded.