kinurenic acid
[2-(N-benzyl-N-phenyl-glycyl)-phenyl]-oxalamic acid ethyl ester
[2-(N-benzoyl-N-phenyl-glycyl)-phenyl]-oxalamic acid ethyl ester
[2-(N-methyl-N-phenyl-glycyl)-phenyl]-oxalamic acid ethyl ester
[2-(N-phenyl-glycyl)-phenyl]-oxalamic acid ethyl ester