ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NCC%28O%29c1ccc%28O%29c%28O%29c1/file?format=sdf&get3d=True  -- CC%28C%29NCC%28O%29c1ccc%28O%29c%28O%29c1 could not be loaded.