ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DCCCC1%28C2CCC%28C2%29C1%3DC%29C%29CO/file?format=sdf&get3d=True  -- CC%28%3DCCCC1%28C2CCC%28C2%29C1%3DC%29C%29CO could not be loaded.