ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%3DC%28N1%29C2COC3%3DCC%3DCC%3DC3O2/file?format=sdf&get3d=True  -- C1CN%3DC%28N1%29C2COC3%3DCC%3DCC%3DC3O2 could not be loaded.