4-butyl-4-hydroxy-1,2-diphenylpyrazolidine-3,5-dione; 4-Butyl-4-hydroxy-1,2-diphenyl-3,5-pyrazolidinedione; 1,2-Diphenyl-4-butyl-4-hydroxypyrazolidine-3,5-dione; NSC 382672; Phenylbutazone Impurity B
4-butyl-4-hydroxy-1,2-diphenylpyrazolidine-3,5-dione; 4-Butyl-4-hydroxy-1,2-diphenyl-3,5-pyrazolidinedione; 1,2-Diphenyl-4-butyl-4-hydroxypyrazolidine-3,5-dione; NSC 382672; Phenylbutazone Impurity B