[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH:6]=[CH:7][C:8]([NH:10][C@H:11]([C:17]([OH:19])=O)[CH2:12][CH2:13][C:14](O)=[O:15])=[O:9].C([N:22]([CH2:25]C)[CH2:23]C)C.C(Cl)(=O)OCC.Cl.[CH3:34][NH:35][CH3:36]>C(Cl)Cl>[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH:6]=[CH:7][C:8]([NH:10][CH:11]([CH2:12][CH2:13][C:14]([N:35]([CH3:36])[CH3:34])=[O:15])[C:17]([N:22]([CH3:25])[CH3:23])=[O:19])=[O:9]In 100 ml of methylene chloride was suspended 5 g of the DL-N-[β-(2-furyl)acryloyl]glutamic acid, and 7 g of triethylamine was added to dissolve it. Subsequently, the resulting solution was cooled to -20° C. to -15° C., after which 4.6 g of ethyl chlorocarbonate was added dropwise, and the resulting mixture was subjected to reaction for 30 minutes. Thereafter, 3.1 g of dimethylamine hydrochloride was added, and the resulting mixture was subjected to reaction at the same temperature for 2 hours. After completion of the reaction, the reaction mixture was washed successively with 50 ml of a 5% aqueous sodium hydroxide solution, 50 ml of diluted hydrochloric acid and 50 ml of water, and dried over anhydrous magnesium sulfate, after which the solvent was removed by distillation under reduced pressure to obtain 3.5 g (yield 55%) of DL-2-[β-(2-furyl)acrylamido]-N1,N1,N5,N5 -tetramethyl-pentane-1,5-diamide having a melting point of 178°-180° C.
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