ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28CC1%3DC2CCCOC2%3DC%28C3%3DC1OC%3DC3%29Br%29N/file?format=sdf&get3d=True  -- CC%28CC1%3DC2CCCOC2%3DC%28C3%3DC1OC%3DC3%29Br%29N could not be loaded.