ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2c1c%28c%28%5BnH%5Dc1CCC2CN3CCOCC3%29C%29CC/file?format=sdf&get3d=True  -- O%3DC2c1c%28c%28%5BnH%5Dc1CCC2CN3CCOCC3%29C%29CC could not be loaded.