ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC%3DCC%28%3DO%29+CCC1%3DCC%28%3DC%28C%3DC1%29O%29OC/file?format=sdf&get3d=True -- CCCCCC%3DCC%28%3DO%29+CCC1%3DCC%28%3DC%28C%3DC1%29O%29OC could not be loaded.