1-Propanesulfonic acid, 3-(3-hydroxy-4-(3-(3-hydroxy-4-methoxyphenyl)-1-oxo-2-propenyl)phenoxy)-, monopotassium salt 3-(3-Hydroxy-4-(3-(3-hydroxy-4-methoxyphenyl)-1-oxo-2-propenyl)phenoxy)-1-propanesulfonic acid monopotassium salt 70413-02-4