ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29%5BC%40H%5D1NC%28%3DO%29CC1/file?format=sdf&get3d=True  -- O%3DC%28O%29%5BC%40H%5D1NC%28%3DO%29CC1 could not be loaded.