ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC1%3DCC%28%3DC2C3%3DCC%28CCC3C%28OC2%3DC1%29%28C%29C%29C%29O/file?format=sdf&get3d=True  -- CCCCCC1%3DCC%28%3DC2C3%3DCC%28CCC3C%28OC2%3DC1%29%28C%29C%29C%29O could not be loaded.