ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DCCCC%28C%29%28O%29C1CCC%28%3DCC1%29C%29C/file?format=sdf&get3d=True  -- CC%28%3DCCCC%28C%29%28O%29C1CCC%28%3DCC1%29C%29C could not be loaded.