ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC3C%28CC%28C%29C%29CN2C%28c1c%28cc%28OC%29c%28OC%29c1%29CC2%29C3/file?format=sdf&get3d=True  -- O%3DC3C%28CC%28C%29C%29CN2C%28c1c%28cc%28OC%29c%28OC%29c1%29CC2%29C3 could not be loaded.