ERROR opening https://cactus.nci.nih.gov/chemical/structure/c13ccccc1cccc3C%28%3DO%29c4ccc%28OCCCCC%29c2ccccc24/file?format=sdf&get3d=True  -- c13ccccc1cccc3C%28%3DO%29c4ccc%28OCCCCC%29c2ccccc24 could not be loaded.