major and minor pathways of metabolism in the mammalian cns result in the formation of 3-methoxy-4-hydroxyphenylethylene glycol ( mhpg ) and normetanephrine ( nmn ) from norepinephrine ( ne ) , and homovanillic acid ( hva ) and 3-methoxytyramine ( 3-mt ) from dopamine ( da ) , respectively .
C0028385
normetanephrine
C0028351
norepinephrine