ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DCC%28%3DC%28C%3DC1OC%29CC%28C%29N%29OC/file?format=sdf&get3d=True -- CCC1%3DCC%28%3DC%28C%3DC1OC%29CC%28C%29N%29OC could not be loaded.