[NH:1]1[CH2:6][CH2:5][CH:4]([N:7]([CH3:12])[C:8](=[O:11])[CH2:9][CH3:10])[CH2:3][CH2:2]1.[C:13]([O:17][CH2:18][CH3:19])(=[O:16])[CH:14]=[CH2:15]>C(O)C>[CH2:18]([O:17][C:13]([CH2:14][CH2:15][N:1]1[CH2:6][CH2:5][CH:4]([N:7]([CH3:12])[C:8](=[O:11])[CH2:9][CH3:10])[CH2:3][CH2:2]1)=[O:16])[CH3:19]7.4 g of the compound obtained in Stage C of Example 1 are dissolved in 10 ml of ethanol, then 4.73 ml of ethyl acrylate dissolved in 12 ml of ethanol are poured onto the solution. The mixture is left at room temperature for one night, and then concentrated in a rotary evaporator and distilled in a Kugelrohr to yield the compound in the form of an oil.
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