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