ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNC1%28CCCCC1%3DO%29C2%3DCC%3DCC%3DC2Cl/file?format=sdf&get3d=True -- CNC1%28CCCCC1%3DO%29C2%3DCC%3DCC%3DC2Cl could not be loaded.