ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29OC12CC%28C3%28CC%28C1C3OC%28%3DO%29/file?format=sdf&get3d=True  -- CC%28%3DO%29OC12CC%28C3%28CC%28C1C3OC%28%3DO%29 could not be loaded.