ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%28C%29C%29COC3c1ccccc1CCc2c3cccc2/file?format=sdf&get3d=True  -- O%3DC%28N%28C%29C%29COC3c1ccccc1CCc2c3cccc2 could not be loaded.