Involved in production of the antifungal phytoalexin zealexin A1 (PubMed:26471326). The enzyme sequentially oxidizes(S)-beta-macrocarpene via alcohol and aldehyde intermediates to form zealexin A1, a maize phytoalexin that provides biochemical protection against fungal infection (PubMed:26471326). (S)-beta-macrocarpene + 3 O2 + 3 reduced [NADPH--hemoprotein reductase] = 4 H(+) + 4 H2O + 3 oxidized [NADPH--hemoprotein reductase] + zealexin A1 Belongs to the cytochrome P450 family.