4-[(2-acetamido-4-oxo-1H-pteridin-6-yl)methyl-acetylamino]benzoic acid

2-[[4-(3-amino-1-oxo-5,6,6a,7,9,10-hexahydro-4H-pyrazino[1,2-f]pteridin-8-yl)benzoyl]amino]pentanedioic acid

2-[[4-[[2-amino-5-(carboxymethyl)-4-oxo-1,6,7,8-tetrahydropteridin-6-yl]methylamino]benzoyl]amino]pentanedioic acid

2-[[4-[(2-amino-4-oxo-1H-pteridin-6-yl)methyl-(2-chloroacetyl)amino]benzoyl]amino]pentanedioic acid

2-[[4-[(2-amino-4-oxo-1H-pteridin-6-yl)methyl-(3-chloropropanoyl)amino]benzoyl]amino]pentanedioic acid