ERROR opening https://cactus.nci.nih.gov/chemical/structure/IC%28C%3DC1OC%29%3DC%28OC%29C%3DC1C%5BC%40H%5D%28C%29N/file?format=sdf&get3d=True -- IC%28C%3DC1OC%29%3DC%28OC%29C%3DC1C%5BC%40H%5D%28C%29N could not be loaded.