ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NCC%28O%29COc2cccc1%5BnH%5Dccc12/file?format=sdf&get3d=True  -- CC%28C%29NCC%28O%29COc2cccc1%5BnH%5Dccc12 could not be loaded.