TRIBOA beta-D-glucoside + S-adenosyl-L-methionine => DIMBOA beta-D-glucoside + S-adenosyl-L-homocysteine + H(+)
triboa beta-d-glucoside + s-adenosyl-l-methionine => dimboa beta-d-glucoside + s-adenosyl-l-homocysteine + h(+)