ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29NCC%28C1%3DCC%28%3DNO1%29Br%29O/file?format=sdf&get3d=True  -- CC%28C%29%28C%29NCC%28C1%3DCC%28%3DNO1%29Br%29O could not be loaded.