ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29CCC%3D5c2nc%28cc4c%28c%28c%28cc1c%28c/file?format=sdf&get3d=True  -- O%3DC%28O%29CCC%3D5c2nc%28cc4c%28c%28c%28cc1c%28c could not be loaded.