24-methylidenelophenol + 2 ferrocytochrome b5 + O2 + 2 H+ = 4alpha-(hydroxymethyl)ergosta-7,24(241)-dien-3beta-ol + 2 ferricytochrome b5 + H2O
(1a)
24-methylidenelophenol + 6 ferrocytochrome b5 + 3 O2 + 6 H+ = 3beta-hydroxyergosta-7,24(241)-dien-4alpha-carboxylate + 6 ferricytochrome b5 + 4 H2O
overall reaction
4alpha-(hydroxymethyl)ergosta-7,24(241)-dien-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 4alpha-formylergosta-7,24(241)-dien-3beta-ol + 2 ferricytochrome b5 + 2 H2O
(1b)
4alpha-formylergosta-7,24(241)-dien-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 3beta-hydroxyergosta-7,24(241)-dien-4alpha-carboxylate + 2 ferricytochrome b5 + H2O
(1c)