ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28COC1%3DCC%3DC%28Cl%29C%3DC1Cl%29%3DO/file?format=sdf&get3d=True  -- OC%28COC1%3DCC%3DC%28Cl%29C%3DC1Cl%29%3DO could not be loaded.