ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BC%40%40%5D1%28%5BC%40H%5D2C%5BC%40H%5D3%5BC%40%40H%5D%28C%28%3DC%28C%28%3DO%29%5BC%40%5D3%28C%28%3DC2C%28%3DO%29C4%3DC1C%3DCC%3DC4O%29O%29O%29C%28%3DO%29NCNCCCC%5BC%40%40H%5D%28C%28%3DO%29O%29N%29O%29N%28C%29C%29O/file?format=sdf&get3d=True -- C%5BC%40%40%5D1%28%5BC%40H%5D2C%5BC%40H%5D3%5BC%40%40H%5D%28C%28%3DC%28C%28%3DO%29%5BC%40%5D3%28C%28%3DC2C%28%3DO%29C4%3DC1C%3DCC%3DC4O%29O%29O%29C%28%3DO%29NCNCCCC%5BC%40%40H%5D%28C%28%3DO%29O%29N%29O%29N%28C%29C%29O could not be loaded.