(S)-4-tert-Butylcarbamoyl-4-{4-[(2,4-diamino-pteridin-6-ylmethyl)-methyl-amino]-benzoylamino}-butyric acid tert-butyl ester

(S)-4-Butylcarbamoyl-4-{4-[(2,4-diamino-pteridin-6-ylmethyl)-methyl-amino]-benzoylamino}-butyric acid tert-butyl ester

(S)-2-{4-[(2,4-Diamino-pteridin-6-ylmethyl)-methyl-amino]-benzoylamino}-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester

(S)-2-{4-[Methyl-(2,2,2-trifluoro-acetyl)-amino]-benzoylamino}-4-propylcarbamoyl-butyric acid tert-butyl ester

(S)-2-{4-[Methyl-(2,2,2-trifluoro-acetyl)-amino]-benzoylamino}-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester