label: a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + NAD(+) <=> a 4alpha-methyl-3-oxosteroid + CO2 + NADH
label_lc: a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + nad(+) <=> a 4alpha-methyl-3-oxosteroid + co2 + nadh