ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29c1c%28O%29%20c%28C%28C%29%28C%29C%29ccc1/file?format=sdf&get3d=True -- CC%28C%29%28C%29c1c%28O%29%20c%28C%28C%29%28C%29C%29ccc1 could not be loaded.