ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc1ccccc1OCC%28O%29CNC%28C%29%28C%29C%29c2occc2/file?format=sdf&get3d=True -- O%3DC%28Nc1ccccc1OCC%28O%29CNC%28C%29%28C%29C%29c2occc2 could not be loaded.