The purpose of the present invention is to improve the solubility of a 3-[2-fluoro-5-(2,3-difluoro-6-methoxybenzyloxy)- 4-methoxyphenyl]-2,4-dioxo-1,2,3,4-tetrahydrothieno[3,4-d] pyrimidine-5-carboxylic acid. Disclosed is a choline salt represented by formula (A), which has excellent solubility and excellent storage stability.El propósito de la presente invención es mejorar la solubilidad de un ácido 3-[2-fluoro-5-(2, 3-difluoro-6-metoxibenciloxi)-4-meto xifenil]-2,4-dioxo-1, 2, 3, 4-tetrahidrotieno [3, 4-djpirimidin-5-carboxílico. Se describe una sal de colina representada por la fórmula (A), que tiene una excelente solubilidad y una excelente estabilidad en almacenamiento.
