ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC%28C%3DCC1C%28C%28CC%28O1%29O%29O%29CC%3DCCCCC%28%3DO%29O%29O/file?format=sdf&get3d=True  -- CCCCCC%28C%3DCC1C%28C%28CC%28O1%29O%29O%29CC%3DCCCCC%28%3DO%29O%29O could not be loaded.