ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCc%28c3%29c1ccccc1c3%3DCc2cccc4ccccc24/file?format=sdf&get3d=True  -- CCCCCc%28c3%29c1ccccc1c3%3DCc2cccc4ccccc24 could not be loaded.