2 Fe(II)-[cytochrome c3] + 2 H(+) => 2 Fe(III)-[cytochrome c3] + H2
2 fe(ii)-[cytochrome c3] + 2 h(+) => 2 fe(iii)-[cytochrome c3] + h2
2 Fe(II)-[cytochrome c3] + 2 H(+) => 2 Fe(III)-[cytochrome c3] + H2
2 fe(ii)-[cytochrome c3] + 2 h(+) => 2 fe(iii)-[cytochrome c3] + h2