ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28O%29C%28C%28C%29CN%28C%29C%29%28c1ccccc1%29c2ccccc2/file?format=sdf&get3d=True  -- CCC%28O%29C%28C%28C%29CN%28C%29C%29%28c1ccccc1%29c2ccccc2 could not be loaded.