1-Propanesulfonic acid, 3-((5-hydroxy-2-(3-hydroxy-4-methoxyphenyl)-4-oxo-4H-1-benzopyran-7-yl)oxy)-, monopotassium salt 3-((5-Hydroxy-2-(3-hydroxy-4-methoxyphenyl)-4-oxo-4H-1-benzopyran-7-yl)oxy)-1-propanesulfonic acid monopotassium salt 70412-86-1