ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29C3%3DCN1c2c%28cc%28F%29cc2CCC1C%29C3%3DO/file?format=sdf&get3d=True  -- O%3DC%28O%29C3%3DCN1c2c%28cc%28F%29cc2CCC1C%29C3%3DO could not be loaded.