preferred_name: a carboxylate + glycerol + H(+) => a 2-acylglycerol + H2O
preferred_name_lc: a carboxylate + glycerol + h(+) => a 2-acylglycerol + h2o
label: a carboxylate + glycerol + H(+) => a 2-acylglycerol + H2O
label_lc: a carboxylate + glycerol + h(+) => a 2-acylglycerol + h2o