The enzyme deoxylimonate A-ring-lactonase (EC 3.1.1.46) catalyzes the reaction
The reaction opens the A-ring-lactone of the triterpenoid deoxylimonic acid, leaving the <small>D</small>-ring-lactone intact.
This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name is deoxylimonate A-ring-lactonohydrolase.