16-hydroxytabersonine + S-adenosyl-L-methionine <=> 16-methoxytabersonine + S-adenosyl-L-homocysteine + H(+)
16-hydroxytabersonine + s-adenosyl-l-methionine <=> 16-methoxytabersonine + s-adenosyl-l-homocysteine + h(+)
16-hydroxytabersonine + S-adenosyl-L-methionine <=> 16-methoxytabersonine + S-adenosyl-L-homocysteine + H(+)
16-hydroxytabersonine + s-adenosyl-l-methionine <=> 16-methoxytabersonine + s-adenosyl-l-homocysteine + h(+)