(24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestan-26-oyl-CoA + AH2 => (25R)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-oyl-CoA + A + H2O
(24r,25r)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestan-26-oyl-coa + ah2 => (25r)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-oyl-coa + a + h2o