ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28CCC%28C%29C%29C%28c1ccccc1%29CN2CCCC2/file?format=sdf&get3d=True  -- O%28CCC%28C%29C%29C%28c1ccccc1%29CN2CCCC2 could not be loaded.