Gravar-mail: 4-[(5-Bromo-2-hydroxy­benzyl­idene)amino]-N-(4,6-dimethyl­pyrimidin-2-yl)benzene­sulfonamide–4-bromo-2-[(E)-({4-[(4,6-dimethyl­pyrimidin-2-yl)sulfamo­yl]phen­yl}iminio)meth­yl]phenolate [0.61 (7)/0.39 (7)]