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