N-<4-prop-2-ynylamino>benzoyl>-L-glutamic acid

diethyl 2-desamino-2-methyl-N1-(trifluoroacetyl)-5,8-dideaza-1,2-dihydrofolate

(S)-2-{4-[(2-Methyl-4-methylsulfanyl-quinazolin-6-ylmethyl)-prop-2-ynyl-amino]-benzoylamino}-pentanedioic acid diethyl ester

diethyl 2-desamino-2-methyl-N1-<(pivaloyloxy)methyl>-N10-propargyl-3,5,8-trideazafolate

10-propargyl-5-deazaaminopterin diethyl ester