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