p. 212 - 215
(1990)4-(4-Amino-2-ethyl-3-oxo-butyl)-benzoic acid methyl ester
9-ethyl-10-deazaminopterin diethyl ester
2-{4-[2-(2,4-Diamino-pteridin-6-yl)-butyl]-benzoylamino}-pentanedioic acid
4-[4-(2,6-Diamino-5-nitro-pyrimidin-4-ylamino)-2-ethyl-3-oxo-butyl]-benzoic acid methyl ester
4-[2-(2,4-Diamino-pteridin-6-yl)-butyl]-benzoic acid methyl ester