The present Invention provides a compound represented by the formula (i) or its Salt acceptable from the point of view of pharmaceutical or Pharmaceutical Product or a Pharmaceutical composition containing the same as active ingredient.It has excellent xanthine oxidase Inhibitory activity and is useful as a Therapeutic Agent and a preventive agent for Diseases associated with xanthine oxidase such as gout, hyperuricemia and Tumor Lysis Syndrome, urinary Stones, hypertension, dyslipidemia, diabetes, disease Is cardiovascular disease such as atherosclerosis and heart failure.Renal diseases such as diabetic nephropathy, respiratory diseases such as chronic obstructive pulmonary disease, inflammatory bowel disease or autoimmune diseasesLa presente invencion proporciona un compuesto representado por la formula (I) o una de sus sales aceptables desde el punto de vista farmaceutico o un producto farmaceutico o una composicion farmaceutica que contiene el mismo como principio activo, que tiene una excelente actividad inhibidora de xantina oxidasa y es util como un agente terapeutico o un agente preventivo para enfermedades asociadas con xantina oxidasa tales como gota, hiperuricemia, sindrome de lisis tumoral, calculos urinarios, hipertension, dislipidemia, diabetes, enfermedades cardiovasculares tales como ateroesclerosis o insuficiencia cardiaca, enfermedades renales tales como nefropatia diabetica, enfermedades respiratorias tales como enfermedades pulmonares obstructivas cronicas, enfermedades de inflamacion intestinal o enfermedades autoinmunes
