Enzyme of the diterpenoid metabolism involved in the biosynthesis of the oryzalexin class of phytoalexins. Can use ent-sandaracopimaradien and syn-stemodene as substrates, but no activity with syn-stemoden-19-oic acid. Hydroxylates 3-alpha-hydroxy-ent-sandaracopimaradiene at C-9-beta, resulting in a 3-alpha,9-beta-diol corresponding to oryzalexins E. ent-sandaracopimaradien-3beta-ol + O2 + reduced [NADPH--hemoprotein reductase] = H(+) + H2O + oryzalexin E + oxidized [NADPH--hemoprotein reductase] kcat is 0.046 sec(-1) with ent-sandaracopimaradien as substrate. kcat is 0.020 sec(-1) with syn-stemodene as substrate. Up-regulated by methyl jasmonate. Belongs to the cytochrome P450 family.