ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC%3DC%28C1%29C2%28CCCC2%3DO%29CCN3CCOCC3/file?format=sdf&get3d=True  -- C1CC%3DC%28C1%29C2%28CCCC2%3DO%29CCN3CCOCC3 could not be loaded.