2-[(R)-1-((S)-2-tert-Butoxycarbonylamino-2-carbamoyl-ethylamino)-2-carbamoyl-ethyl]-5-methyl-pyrimidine-4-carboxylic acid

2-[(R)-1-((S)-2-tert-Butoxycarbonylamino-2-carbamoyl-ethylamino)-2-carbamoyl-ethyl]-5-methyl-pyrimidine-4-carboxylic acid methyl ester

2-[(R)-1-((S)-2-tert-Butoxycarbonylamino-2-carbamoyl-ethylamino)-2-carbamoyl-ethyl]-6-dimethylamino-5-methyl-pyrimidine-4-carboxylic acid

2-[(R)-1-((S)-2-tert-Butoxycarbonylamino-2-carbamoyl-ethylamino)-2-carbamoyl-ethyl]-6-dimethylamino-5-methyl-pyrimidine-4-carboxylic acid ethyl ester

ethyl 6-chloro-2-formyl-5-methylpyrimidine-4-carboxylate