ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCOC%28%26%2361%3BO%29OC%28%26%2361%3BO%29OCC/file?format=sdf&get3d=True  -- CCOC%28%26%2361%3BO%29OC%28%26%2361%3BO%29OCC could not be loaded.