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Structures of PrecursorZ, molybdopterin (MPT), Moco, and their derivatives. PrecursorZ is cyclic pyranopterin monophosphate (cPMP), and CompoundZ is its air-oxidized product. MPT and Moco are both 5,6,7,8-tetrahydropyranopterins. FormB is the air-oxidized degradation product of MPT and Moco, whereas FormA is the iodine-oxidized derivative. FormA and FormB are shown in their phosphorylated forms. Urothione is the degradation product of Moco in humans, which is excreted in the urine.
