ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28NC%3DC2CCN%28C%29C%29C2%3DCC%3DC1/file?format=sdf&get3d=True  -- CC1%3DC%28NC%3DC2CCN%28C%29C%29C2%3DCC%3DC1 could not be loaded.