ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29NCCc1c%5BnH%5Dc2c1cc%28cc2%29OC/file?format=sdf&get3d=True  -- CC%28%3DO%29NCCc1c%5BnH%5Dc2c1cc%28cc2%29OC could not be loaded.