. "Some organism possess a monofunctional beta-amyrin synthase, other have a multifunctional enzyme that also catalyzes the synthesis of alpha-amyrin (EC 5.4.99.40) or lupeol (EC 5.4.99.41)." . . . "Beta-amyrin synthase" . "2,3-oxidosqualene beta-amyrin cyclase" . . "(3S)-2,3-epoxy-2,3-dihydrosqualene = beta-amyrin." .