preferred_name: 2 Fe(III)-[cytochrome b561] + 4alpha-carboxy-4beta-methyl-5alpha-cholest-7-ene-3beta-ol + H2O => 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + 2 Fe(II)-[cytochrome b5] + O2 + H(+)