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(2S)-N-Boc-5-methylpyrrolidine-2-carboxylic acid (1S,3S,5S)-2-(TERT-BUTOXYCARBONYL)-2-AZABICYCLO[3.1.0]HEXANE-3-CARBOXYLIC ACID METHYL (2S,4S)-1-(TERT-BUTOXYCARBONYL)-4-METHYLPYROGLUTAMATE (4S)-1-BOC-4-BENZYL-L-PROLINE (2S,4R)-BOC-4-PHENYL-PYRROLIDINE-2-CARBOXYLIC ACID N-BOC-CIS-4-CYANO-L-PROLINE METHYL ESTER