Friedelin synthase () is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, friedelin-forming). This enzyme catalyses the following chemical reaction
(3S)-2,3-epoxy-2,3-dihydrosqualene friedelin
The enzyme from Kalanchoe daigremontiana also gives traces of other triterpenoids.
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