ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1CCC2%28O1%29C%28CCCC2%28C%29OC%28%3DO%29C%29%28C%29C/file?format=sdf&get3d=True  -- CC1CCC2%28O1%29C%28CCCC2%28C%29OC%28%3DO%29C%29%28C%29C could not be loaded.