porphobilinogen + 2 H2O + H(+) => 2 5-aminolevulinate
porphobilinogen + 2 h2o + h(+) => 2 5-aminolevulinate
porphobilinogen + 2 H2O + H(+) => 2 5-aminolevulinate
porphobilinogen + 2 h2o + h(+) => 2 5-aminolevulinate