ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNCCc1c%5BnH%5Dc2cc%28Br%29c%28Br%29cc12/file?format=sdf&get3d=True  -- CNCCc1c%5BnH%5Dc2cc%28Br%29c%28Br%29cc12 could not be loaded.