Synonyms: Des[N-[(1S)-1-[2-(cyclopropylaMino)-2-oxoacetyl]butyl]carboxaMido] 1-Carboxy Telaprevir;(1S,3aR,6aS)-(2S)-2-Cyclohexyl-N-(2-pyrazinylcarbonyl)glycyl-3-Methyl-L-valyloctahydrocyclopenta[c]pyrrole-1-carboxylic Acid;(1S,3aR,6aS)-(2S)-2-Cyclohexyl-N-(pyrazin;Cyclopenta[c]pyrrole-1-carboxylic acid, (2S)-2-cyclohexyl-N-(2-pyrazinylcarbonyl)glycyl-3-Methyl-L-valyloctahydro-, (1S,3aR,6aS)-;Cyclopenta[c]pyrrole-1-carboxylic acid, (2S)-2-cyclohexyl-N-(pyrazinylcarbonyl)glycyl-3-Methyl-L-valyloctahydro-, (1S,3aR,6aS)-