ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3Dc1cc%5BnH%5Dc%28%3DS%29%5BnH%5D1/file?format=sdf&get3d=True  -- O%3Dc1cc%5BnH%5Dc%28%3DS%29%5BnH%5D1 could not be loaded.