ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29NCC%28COc1cccc2c1CCN%28C2%29C%3DO%29O/file?format=sdf&get3d=True  -- CC%28C%29%28C%29NCC%28COc1cccc2c1CCN%28C2%29C%3DO%29O could not be loaded.