3-hydroxy-5-methyl-1-naphthoate + S-adenosyl-L-methionine <=> 3-methoxy-5-methyl-1-naphthoate + S-adenosyl-L-homocysteine + H(+)
3-hydroxy-5-methyl-1-naphthoate + s-adenosyl-l-methionine <=> 3-methoxy-5-methyl-1-naphthoate + s-adenosyl-l-homocysteine + h(+)