ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28C%28CC1C%28%3DO%29O%29CC%28%3DO%29O%29C/file?format=sdf&get3d=True -- CC1%28C%28CC1C%28%3DO%29O%29CC%28%3DO%29O%29C could not be loaded.