ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28N1CCCC1%29C%28C2%3DCC%3DC3OCCC3%3DC2%29%3DO/file?format=sdf&get3d=True  -- CCCC%28N1CCCC1%29C%28C2%3DCC%3DC3OCCC3%3DC2%29%3DO could not be loaded.