Cytochrome P450 monooxygenase; part of the gene cluster that mediates the biosynthesis of aculenes, a unique type of norsesquiterpenes that contain a nordaucane skeleton linked to an L-proline moiety and are of mixed biosynthetic origin (PubMed:31618514). The pathway begins with the synthesis of dauca-4,7-diene by the terpene cyclase aneC using farnesyl pyrophosphate (FPP) as substrate (PubMed:31618514). The cytochrome P450 monooxygenase aneF then performs the initial oxidation at C-12 of dauca-4,7-diene to yield asperaculane D (PubMed:31618514). Asperaculane D is substrate of the cytochrome P450 monooxygenase aneD for C-10 hydroxylation to yield asperaculane E (PubMed:31618514). The cytochrome P450 monooxygenase aneG then converts asperaculane E into aculene D via C-2 oxidation (PubMed:31618514). The monomodular nonribosomal peptide synthtase aneB adenylates L-proline and the thiohydrolase aneE transfers this activated L-proline derivative to aculenes D and C to produce respectively aculenes B and A (PubMed:31618514). The dioxygenase aneA converts aculene D into aculene C, and aculene B into aculene A by introducing the 5,6-alkene moiety (PubMed:31618514). Asperculanes A, B, C and F, as well as 14-prolyl asperculane C, might be shunt products of the pathway (PubMed:31618514). asperaculane D + O2 + reduced [NADPH--hemoprotein reductase] = asperaculane E + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Secondary metabolite biosynthesis. Abolishes the formation of aculene A and accumulates asperculane C as a major product and 14-prolyl asperculane C as a minor product. Belongs to the cytochrome P450 family.