2-amino-3-cyano-6-(4-carboxyphenyl)-5,6,7,8-tetrahydropyrido<4,3-b>pyridine

2-amino-3-cyano-6-<4-(tert-butoxycarbonyl)phenyl>-5,6,7,8-tetrahydropyrido<4,3-b>pyridine

2,4-diamino-7-(4-carboxyphenyl)-5-deaza-6,7,8,9-tetrahydropyrido<3,4-g>pteridine

4-(2-Amino-4-oxo-3,5,7,8-tetrahydro-4H-1,3,6,9-tetraaza-anthracen-6-yl)-benzoic acid

2,4-diamino-7-<4-(tert-butoxycarbonyl)phenyl>-5-deaza-6,7,8,9-tetrahydropyrido<3,4-g>pteridine