ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28C1CC1%29C%28%3DO%29%5BC%40%40H%5D3C%3DC2c4cccc5ncc%28C%5BC%40H%5D2N%28C%29C3%29c45/file?format=sdf&get3d=True  -- CCN%28C1CC1%29C%28%3DO%29%5BC%40%40H%5D3C%3DC2c4cccc5ncc%28C%5BC%40H%5D2N%28C%29C3%29c45 could not be loaded.