label: N-methylmescaline + S-adenosyl-L-methionine => N,N-dimethylmescaline + S-adenosyl-L-homocysteine + H(+)
label_lc: n-methylmescaline + s-adenosyl-l-methionine => n,n-dimethylmescaline + s-adenosyl-l-homocysteine + h(+)