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