| Synonyms: | PHENYLBUTAZONE;1,2-Diphenyl-2,3-dioxo-4-N-butylpyrazoline;1,2-Diphenyl-3,5-dioxo-4-butylpyrazolidine;1,2-Diphenyl-4-butyl-3,5-dioxopyrazolidine;1,2-Diphenyl-4-butyl-3,5-pyrazolidinedione;3,5-dioxe-4buty-1,diphenyl-pyrazolidine;3,5-dioxo01,2-diphenyl-4-m-butyl-pyrazolidine;3,5-Dioxo-1,2-diphenyl-4-N-butyl-pyrazolidin |