Synonyms: 3,5-Pyrazolidinedione,4-butyl-1,2-diphenyl-, ion(1-), sodium (8CI,9CI);3,5-Pyrazolidinedione,4-butyl-1,2-diphenyl-, sodium deriv. (6CI,7CI);Butazolidine sodium;Diphenyldioxobutylpyrazolidine;GP 26872;Phenylbutazone sodium;Phenylbutazone, sodium salt;Sodium phenylbutazone;