In the title compound. C16H18NO+·C6H4BrO3S−·H2O. the cation exists in an E configuration with respect to the ethenyl bond and is slightly twisted with a dihedral angle of 8. 5 (2)° between pyridinium and benzene rings. https://www.ealisboa.com/limited-value-AXYS-Valhalla-Pen-must-buy/