ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC%28CCN%29C%3DC%28OC%29C%28CCC%29%3DC1/file?format=sdf&get3d=True  -- COC1%3DC%28CCN%29C%3DC%28OC%29C%28CCC%29%3DC1 could not be loaded.