label: 7alpha,12alpha-dihydroxy-3-oxochol-4-en-24-oate => 12alpha-hydroxy-3-oxochola-4,6-dien-24-oate + H2O
label_lc: 7alpha,12alpha-dihydroxy-3-oxochol-4-en-24-oate => 12alpha-hydroxy-3-oxochola-4,6-dien-24-oate + h2o