ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%29Cc1ccc%28cc1%29OCC%28O%29CNC%28C%29C/file?format=sdf&get3d=True  -- O%3DC%28N%29Cc1ccc%28cc1%29OCC%28O%29CNC%28C%29C could not be loaded.