compounds providing effective competition for l-asparagine uptake were 4-carbon analogues of the l-isomer with alterations at the beta-amide position , i.e. , 5-diazo-4-oxo-l-norvaline ( ki = 4.6 mum ) , beta-hydroxyamyl-l-aspartic acid ( ki = 10 mum ) , and l-aspartic acid ( ki = 50 mum ) .
C0949752
beta
C0004015
l-aspartic acid