thymine + A + H2O <=> 5-methylbarbiturate + AH2 + H(+)
thymine + a + h2o <=> 5-methylbarbiturate + ah2 + h(+)
thymine + A + H2O <=> 5-methylbarbiturate + AH2 + H(+)
thymine + a + h2o <=> 5-methylbarbiturate + ah2 + h(+)