ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29OC1CC%28C2%28CCC3C%28%3DO%29OC%28CC3/file?format=sdf&get3d=True -- CC%28%3DO%29OC1CC%28C2%28CCC3C%28%3DO%29OC%28CC3 could not be loaded.