N(alpha),N(alpha)-dimethyl-L-histidine + S-adenosyl-L-methionine = hercynine + S-adenosyl-L-homocysteine + H(+)
n(alpha),n(alpha)-dimethyl-l-histidine + s-adenosyl-l-methionine = hercynine + s-adenosyl-l-homocysteine + h(+)
N(alpha),N(alpha)-dimethyl-L-histidine + S-adenosyl-L-methionine = hercynine + S-adenosyl-L-homocysteine + H(+)
n(alpha),n(alpha)-dimethyl-l-histidine + s-adenosyl-l-methionine = hercynine + s-adenosyl-l-homocysteine + h(+)