ERROR opening https://cactus.nci.nih.gov/chemical/structure/S2c1ccccc1/C%28c3c2cccc3%29%3DC4/CCN%28C%29CC4/file?format=sdf&get3d=True  -- S2c1ccccc1/C%28c3c2cccc3%29%3DC4/CCN%28C%29CC4 could not be loaded.