ERROR opening https://cactus.nci.nih.gov/chemical/structure/c14ccccc4cccc1C%28%3DO%29c3c2ccccc2n%28c3C%29CCCCC/file?format=sdf&get3d=True  -- c14ccccc4cccc1C%28%3DO%29c3c2ccccc2n%28c3C%29CCCCC could not be loaded.