ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28%5BC%40H%5D%28C%28%3DO%29O%29N%29S/file?format=sdf&get3d=True  -- CC%28C%29%28%5BC%40H%5D%28C%28%3DO%29O%29N%29S could not be loaded.