Catalyzes C-C bond formation between the carbons ortho to the phenolic hydroxyl of cyclo(L-tyr-L-tyr) (cYY) producing mycocyclosin. Can also use cyclo(L-Tyr-L-Phe) (cYF), cyclo(L-Tyr-L-Trp) (cYW) and cyclo(L-Tyr-L-3,4-dihydroxyphenylalanine) (cY-DOPA) as substrate. cyclo(L-tyrosyl-L-tyrosyl) + 2 H(+) + O2 + 2 reduced [2Fe-2S]-[ferredoxin] = 2 H2O + mycoclysin + 2 oxidized [2Fe-2S]-[ferredoxin] Inhibited by clotrimazole, econazole, ketoconazole, and miconazole. Was identified as a high-confidence drug target. Belongs to the cytochrome P450 family.