ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCNC1%28CCCCC1%29C2%3DCC%28%3DCC%3DC2%29OC/file?format=sdf&get3d=True  -- CCNC1%28CCCCC1%29C2%3DCC%28%3DCC%3DC2%29OC could not be loaded.