ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28CC1%3DC2CCOC2%3DC%28C%3DC1OC%29Br%29N/file?format=sdf&get3d=True  -- CC%28CC1%3DC2CCOC2%3DC%28C%3DC1OC%29Br%29N could not be loaded.