Involved in the biosynthesis of triterpenoid saponins. Catalyzes three sequential oxidation steps at C-30 of 11-oxo-beta-amyrin. Also able to catalyze sequential C-30 hydroxylation of beta-amyrin to produce 30-hydroxy-beta-amyrin and 11-deoxoglycyrrhetinic acid. 11-oxo-beta-amyrin + 3 O2 + 3 reduced [NADPH--hemoprotein reductase] = glycyrrhetinate + 4 H(+) + 4 H2O + 3 oxidized [NADPH--hemoprotein reductase] Expressed in flowers. Detected in roots upon salt treatment. Up-regulated in roots by salt treatment. Belongs to the cytochrome P450 family.