Carbamoyltransferase that mediates 3'-carbamoylation of the noviosyl ring to produce novobiocin, the final step in the novobiocin biosynthesis pathway. Novobiocincin is an aminocoumarin family antibiotic that targets bacterial DNA gyrases. carbamoyl phosphate + descarbamoylnovobiocin = novobiocin + phosphate kcat is 4.1 min(-1) with decarbamoylnovobiocin as substrate. Antibiotic biosynthesis; novobiocin biosynthesis. Belongs to the NodU/CmcH family.