4-butyl-1-(4-hydroxyphenyl)-2-phenylpyrazolidine-3,5-dione;4-Butyl-1-(4-hydroxyphenyl)-2-phenyl-3,5-pyrazolidinedione; 1-Phenyl-2-(p-hydroxyphenyl)-3,5-dioxo-4-butylpyrazolidine; Butapirone; Californit; Crovaril; Oxyphenobutazone; Oxyphenylbutazone; Rapostan; p-Hydroxyphenylbutazone; Visubutina;
