ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%5C1%3DC%28%5CSCCC/1%29Nc2c%28cccc2C%29C/file?format=sdf&get3d=True  -- N%5C1%3DC%28%5CSCCC/1%29Nc2c%28cccc2C%29C could not be loaded.