ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC%28%3DO%29CC1%28CN%29CC2C1C%3DC%28CC%29C2/file?format=sdf&get3d=True  -- COC%28%3DO%29CC1%28CN%29CC2C1C%3DC%28CC%29C2 could not be loaded.