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