ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCCC%29Cc1cc%28OC%29c%28OCC%28%3DO%29N%28CC%29CC%29cc1/file?format=sdf&get3d=True  -- O%3DC%28OCCC%29Cc1cc%28OC%29c%28OCC%28%3DO%29N%28CC%29CC%29cc1 could not be loaded.