ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BH%5D%5BC%40%5D1%28CCN1%29C%28O%29%3DO/file?format=sdf&get3d=True  -- %5BH%5D%5BC%40%5D1%28CCN1%29C%28O%29%3DO could not be loaded.