stereoselective binding of copper ( ii ) , zinc ( ii ) , cobalt ( ii ) , and ni ( ii ) to the optically active amino acids beta- ( 2-pyridyl ) -alpha-alanine and beta- ( 6-methyl-2-pyridyl ) -alpha-alanine , analogs of histidine and phenylalanine .
C0002520
amino acids
C0001898
alanine