phenazine biosynthetic process azophenylene biosynthetic process acridizine biosynthetic process GO:0002047 azophenylene biosynthesis dibenzo-p-diazine biosynthesis dibenzopyrazine biosynthetic process dibenzopyrazine biosynthesis dibenzo-p-diazine biosynthetic process biological_process The chemical reactions and pathways resulting in the formation of a phenazine antibiotic, a polycyclic pyrazine with two nitrogen atoms in the ring. acridizine biosynthesis antibiotic biosynthetic process