preferred_name: a carboxylate + AH2 + H(+) => an aldehyde + A + H2O
preferred_name_lc: a carboxylate + ah2 + h(+) => an aldehyde + a + h2o
label: a carboxylate + AH2 + H(+) => an aldehyde + A + H2O
label_lc: a carboxylate + ah2 + h(+) => an aldehyde + a + h2o