uniquely stable manganese intermediates ( complexes ) are formed from the permanganate ion oxidation of the 5,6-carbon-carbon double bond in several 2,4 ( 1h,3h ) -pyrimidinediones [ uracil , ( compound 7 ) , 5-methyluracil ( thymine , compound 5 ) , and 6-methyluracil ( compound 8 ) ] .
C0041917
uracil
C0040087
thymine