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