2,5-dihydroxybenzoate + O2 <=> 3-maleylpyruvate + H(+)
2,5-dihydroxybenzoate + o2 <=> 3-maleylpyruvate + h(+)
2,5-dihydroxybenzoate + O2 <=> 3-maleylpyruvate + H(+)
2,5-dihydroxybenzoate + o2 <=> 3-maleylpyruvate + h(+)