ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3ccccc3C2CN%28CC%3DC%29CCc%28c1Br%29c2cc%28O%29c1O/file?format=sdf&get3d=True  -- c3ccccc3C2CN%28CC%3DC%29CCc%28c1Br%29c2cc%28O%29c1O could not be loaded.