ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC%28CCC1CC2CCC%28CC2%29N%3DC%3DO%29N%3DC%3DO/file?format=sdf&get3d=True -- C1CC%28CCC1CC2CCC%28CC2%29N%3DC%3DO%29N%3DC%3DO could not be loaded.