caffeine + S-adenosyl-L-homocysteine + H(+) => 1,7-dimethylxanthine + S-adenosyl-L-methionine
caffeine + s-adenosyl-l-homocysteine + h(+) => 1,7-dimethylxanthine + s-adenosyl-l-methionine
caffeine + S-adenosyl-L-homocysteine + H(+) => 1,7-dimethylxanthine + S-adenosyl-L-methionine
caffeine + s-adenosyl-l-homocysteine + h(+) => 1,7-dimethylxanthine + s-adenosyl-l-methionine