1-(3-Chloro-propyl)-1H-pyrazole-3,5-dicarboxylic acid dimethyl ester

dimethyl 1-(3-Azidopropyl)pyrazole-3,5-dicarboxylate

4-{2-[2-((S)-2-Benzyloxycarbonylamino-2-tert-butoxycarbonyl-ethylcarbamoyl)-4-oxo-7,8-dihydro-4H,6H-1,5,8a-triaza-azulen-5-yl]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

4-(2-{2-[(S)-2-(2-Bromo-4-methyl-benzenesulfonylamino)-2-tert-butoxycarbonyl-ethylcarbamoyl]-4-oxo-7,8-dihydro-4H,6H-1,5,8a-triaza-azulen-5-yl}-ethyl)-piperidine-1-carboxylic acid tert-butyl ester

5-[2-(1-tert-Butoxycarbonyl-piperidin-4-yl)-ethyl]-4-oxo-5,6,7,8-tetrahydro-4H-1,5,8a-triaza-azulene-2-carboxylic acid