2-acetamido-7-<4-(tert-butoxycarbonyl)phenyl>-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

D,L-7,10-ethano-5-deazaaminopterin

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

di-tert-butyl N-<4-<6-(2-amino-3-cyano-5,6,7,8-tetrahydropyrido<4,3-b>pyridino)>benzoyl>glutamate