new syntheses of three thyrotropin releasing hormone ( trh ) analogues ( [ dopa2 ] thr , [ nic1 ] trh , and [ tyr ( 30no2 ) 2 ] trh ) have been reported ( dopa stands for l-3,4-dihydroxyphenylalanine , nic -- for nicotinic acid and tyr ( 3-no2 ) -- for l-3-nitrotyrosine ) .
C0023570
dopa
C0013023
dihydroxyphenylalanine