ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28N%29CC1%3DC2OC%3DCC2%3DC%28Br%29C2%3DC1C%3DCO2/file?format=sdf&get3d=True  -- CC%28N%29CC1%3DC2OC%3DCC2%3DC%28Br%29C2%3DC1C%3DCO2 could not be loaded.