mercaptopurine + S-adenosyl-L-methionine = 6-methylthiopurine + S-adenosyl-L-homocysteine + H(+)
mercaptopurine + s-adenosyl-l-methionine = 6-methylthiopurine + s-adenosyl-l-homocysteine + h(+)
mercaptopurine + S-adenosyl-L-methionine = 6-methylthiopurine + S-adenosyl-L-homocysteine + H(+)
mercaptopurine + s-adenosyl-l-methionine = 6-methylthiopurine + s-adenosyl-l-homocysteine + h(+)