oral administrations of dopamine ( 50 mg/body ) and 1-dihydroxyphenylalanine ( l-dopa , 250 mg/body ) increased the plasma levels of these dopamine sulfates almost 100-fold to 1807 +/- 266 and 1674 +/- 195 pmoles/ml of da3s , and 466 +/- 83 and 321 +/- 76 pmoles/ml of da4s .
C0013023
dihydroxyphenylalanine
C0023570
l-dopa