ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28C%28%3DCC%3DC1%29C%29NC2%3DNCCCS2/file?format=sdf&get3d=True  -- CC1%3DC%28C%28%3DCC%3DC1%29C%29NC2%3DNCCCS2 could not be loaded.