ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29%5BC%40H%5D%28N%29Cc1cc%28O%29c%28O%29cc1/file?format=sdf&get3d=True  -- O%3DC%28O%29%5BC%40H%5D%28N%29Cc1cc%28O%29c%28O%29cc1 could not be loaded.