preferred_name: a monoacylglycerol + a fatty acid + H(+) => a diacylglycerol + H2O
preferred_name_lc: a monoacylglycerol + a fatty acid + h(+) => a diacylglycerol + h2o
label: a monoacylglycerol + a fatty acid + H(+) => a diacylglycerol + H2O
label_lc: a monoacylglycerol + a fatty acid + h(+) => a diacylglycerol + h2o