Catalyzes the conversion of cyclic dehypoxanthine futalosine (cyclic DHFL) into 1,4-dihydroxy-6-naphthoate, a step in the biosynthesis of menaquinone (MK, vitamin K2). Quinol/quinone metabolism; menaquinone biosynthesis. Cells lacking this gene require menaquinone-4 (MK 4) for their growth, and accumulate cyclic DHFL. Belongs to the MqnA/MqnD family. MqnD subfamily.