4.6.1.17 cnx3, cyclic pyranopterin monophosphate synthase accessory protein, MoaC, MoaC2, Moco-biosynthesis protein, MOCS1B, molybdenum cofactor biosynthesis protein C, ST0472 - 4.6.1.17 EC 4.1.99.18 formerly, part transferred 4.6.1.17 MoaC the formation of the cyclic pyranopterin monophosphate from GTP is catalyzed by MaoA and requires the action of MoaC