7-methylxanthine + D-ribose + H(+) => 7-methylxanthosine + H2O
7-methylxanthine + d-ribose + h(+) => 7-methylxanthosine + h2o
7-methylxanthine + D-ribose + H(+) => 7-methylxanthosine + H2O
7-methylxanthine + d-ribose + h(+) => 7-methylxanthosine + h2o