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HO
OH
OH
NH
2
OH
HO
O
NH
2
Normetanephrine
Norepinephrine
OH
HO
O
CHO
Norepinephrinealdehyde
Normetanephrinealdehyde
OH
HO
O
OH
O
vanillylmandelic acid
3,4-dihydroxymandelic acid
OH
HO
HO
OH
O
3-Methoxy-4-hydroxyphenylglycol (MHPG)
OH
HO
O
OH
OH
HO
HO
OH
3,4-dihydroxyphenylglycol
HO
OH
OH
CHO
Catechol-O-methyl transferase (COMT)
Monoamine
Aldehyde dehydrogenase
Aldehyde reductase
COMT
COMT
oxidase (MAO)