ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%3DC%28C%28C%28CCC%29NCC%29%3DO%29C%3DC1/file?format=sdf&get3d=True  -- CC1%3DCC%3DC%28C%28C%28CCC%29NCC%29%3DO%29C%3DC1 could not be loaded.