ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCC%29C3%28c1ccccc1%29CCN%28CCN2CCOCC2%29CC3/file?format=sdf&get3d=True  -- O%3DC%28OCC%29C3%28c1ccccc1%29CCN%28CCN2CCOCC2%29CC3 could not be loaded.