(2-tert-butoxy-1-(2-cyclohexyl-1-(1-formyl-2-(2-oxopyrrolidin-3-yl)ethylcarbamoyl)ethylcarbamoyl)propyl)carbamic acid benzyl ester
(2-tert-butoxy-1-(2-cyclohexyl-1-(1-formyl-2-(2-oxopyrrolidin-3-yl)ethylcarbamoyl)ethylcarbamoyl)propyl)carbamic acid benzyl ester