ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNCC%5BC%40H%5D%28N1%29C%28%3DO%29O/file?format=sdf&get3d=True  -- CC1%3DNCC%5BC%40H%5D%28N1%29C%28%3DO%29O could not be loaded.