C[N:2]([CH3:5])C=O.[CH2:6](N(CC)CC)C.[C:13](Cl)(=[O:17])[O:14]CC.Br[C:20]1[CH:21]=[CH:22][C:23]([O:26][C:27]2[CH:28]=[C:29]([CH:33]=[CH:34][CH:35]=2)[C:30](O)=O)=N[CH:25]=1>O1CCCC1>[O:26]([C:27]1[CH:28]=[C:29]([CH:33]=[CH:34][CH:35]=1)[CH2:30][CH:5]([C:13]([OH:17])=[O:14])[NH2:2])[C:23]1[CH:22]=[CH:21][CH:20]=[CH:25][CH:6]=1On the other hand, trans-4-(t-butoxycarbonyl)aminomethylcyclohexylcarbonxylic acid (1.62 g) was dissolved in dry tetrahydrofuran (50 ml) and dry N,N-dimethylformamide (20 ml), triethylamine (0.96 ml) was added to the resultant solution and a solution of ethyl chlorocarbonate (0.76 g) in tetrahydrofuran (2 ml) was added to the mixture under ice-cooling, followed by stirring for 30 minutes. To this solution was added the hydrochloride (III) previously obtained and triethylamine (2 ml) was added to the mixture, followed by stirring at room temperature for 3 hours. Ice-water (200 ml) was added to the reaction mixture and the precipitated crystalline substance was collected by filtration, thoroughly washed with water and dried to obtain 2.62 g of N-[trans-4(t-butyloxycarbonyl)aminomethylcyclohexylcarbonyl]-3-phenoxy-DL-phenylalanine 4-acetylanilide (IV) in the form of a white powder. The compound (IV) was confirmed by an NMR analysis.
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