. "\"Catalysis of the reaction: (S)-2,3-epoxysqualene = beta-amyrin. This reaction is the cyclization and rearrangement of (S)-2,3-epoxysqualene (2,3-oxidosqualene) into beta-amyrin.\" [PMID:9746369]" . . "beta-amyrin synthase activity" . "oxidosqualene:beta-amyrin cyclase activity" . "EC:5.4.99.-" . "MetaCyc:RXN-7570" . .