3,5-Pyrazolidinedione, 4-butyl-1-(4-hydroxyphenyl)-2-phenyl-, monohydrate 4-Butyl-1-(p-hydroxyphenyl)-2-phenyl-3,5-pyrazolidinedione monohydrate 7081-38-1 Oxyphenbutazone Oxyphenbutazone [USAN:BAN:INN]