preferred_name: thymine + A + H2O <=> 5-methylbarbiturate + AH2 + H(+)
preferred_name_lc: thymine + a + h2o <=> 5-methylbarbiturate + ah2 + h(+)
label: thymine + A + H2O <=> 5-methylbarbiturate + AH2 + H(+)
label_lc: thymine + a + h2o <=> 5-methylbarbiturate + ah2 + h(+)