ERROR opening https://cactus.nci.nih.gov/chemical/structure/c42c%28%5CC3%3DC%28/c1ccccc1C2%29CN%28C%29CC3%29cccc4/file?format=sdf&get3d=True  -- c42c%28%5CC3%3DC%28/c1ccccc1C2%29CN%28C%29CC3%29cccc4 could not be loaded.