a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + NADP(+) = a 4alpha-methyl-3-oxosteroid + CO2 + NADPH
a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + nadp(+) = a 4alpha-methyl-3-oxosteroid + co2 + nadph
a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + NADP(+) = a 4alpha-methyl-3-oxosteroid + CO2 + NADPH
a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + nadp(+) = a 4alpha-methyl-3-oxosteroid + co2 + nadph