Cytochrome P450 monooxygenase; part of the gene cluster that mediates the biosynthesis of the dimeric diketopiperazine alkaloid ditryptophenaline (PubMed:24677498). The nonribosomal peptide synthase dtpA accepts L-tryptophan and L-phenylalanine as its substrates and forms the phenylalanyl-tryptophanyl cyclic dipeptide product cyclophenylalanyltryptophenyl (PubMed:24677498). The N-methyltransferase dtpB is responsible for the N-methylation of cyclophenylalanyltryptophenyl to yield cyclo-N-methylphenylalanyltryptophenyl (PubMed:24677498). The cytochrome P450 monooxygenase is responsible not only for pyrroloindole ring formation but also for concurrent dimerization of N-methylphenylalanyltryptophanyl diketopiperazine monomers into a homodimeric product (PubMed:24677498). Alkaloid biosynthesis. Secondary metabolite biosynthesis. Abolishes the production of ditryptophenaline but leads to the accumulation of cyclo-N-methylphenylalanyltryptophenyl (PubMed:24677498). Belongs to the cytochrome P450 family.