dopamine , norepinephrine , and epinephrine were incubated with catechol-o-methyl transferase ( comt ) and [ 3h ] s-acenosyl methionine ( [ 3h ] sam ) and were converted to the o-methylated tritiated derivatives : [ 3h ] methoxytyramine , [ 3h ] normetanephrine , and [ 3h ] metanephrine , respectively .
C0028351
norepinephrine
C0014563
epinephrine