2-acetamido-7-(4-carboxyphenyl)-5-deaza-6,7,8,9-tetrahydro-4(3H)-pyrido<3,4-g>pteridinone

4-(2-acetamido-4-oxo-3,6,8,9-tetrahydropyrimido[4,5-b][1,6]naphthyridin-7(4H)-yl)benzoic acetic anhydride

diethyl N-<4-<7-(2-acetamido-5-deaza-4(3H)-oxo-6,7,8,9-tetrahydropyrido<3,4-g>pteridino)>benzoyl>-L-glutamate