ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29c1cc%28ccc1O%29c2ccc%28F%29cc2F/file?format=sdf&get3d=True  -- O%3DC%28O%29c1cc%28ccc1O%29c2ccc%28F%29cc2F could not be loaded.