ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28NCCc1cc%28OC%29c%28OC%29c%28OC%29c1%29C/file?format=sdf&get3d=True  -- O%3DC%28NCCc1cc%28OC%29c%28OC%29c%28OC%29c1%29C could not be loaded.