Involved in the production of antifungal dolabralexin phytoalexins in response to biotic and abiotic stresses (PubMed:29475898). Catalyzes the epoxidation of dolabradiene at C-16, followed by hydroxylation at C-3, to yield the epoxides 15,16-epoxydolabrene (epoxydolabrene) and 3b-hydroxy-15,16-epoxydolabrene (epoxydolabranol) (PubMed:29475898). dolabradiene + O2 + reduced [NADPH--hemoprotein reductase] = 15,16-epoxydolabrene + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 15,16-epoxydolabrene + O2 + reduced [NADPH--hemoprotein reductase] = 3beta-hydroxy-15,16-epoxydolabrene + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Belongs to the cytochrome P450 family.