4-Hydroxybenzoic acid dipotassium salt Benzoic acid, 4-hydroxy-, dipotassium salt Benzoic acid, 4-hydroxy-, potassium salt (1:2) Benzoic acid, p-hydroxy-, dipotassium salt Benzoic acid, p-hydroxy-, potassium deriv., potassium salt Dipotassium p-hydroxybenzoate p-Hydroxybenzoic acid dipotassium salt Potassium, (p-carboxyphenoxy)-, potassium salt