[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][N:9]2[CH2:13][CH2:12][NH:11][C:10]2=[CH:14][N+:15]([O-:17])=[O:16])=[CH:4][CH:3]=1.[CH2:18]=O.[SH:20][CH2:21][Si:22]([CH3:25])([CH3:24])[CH3:23]>C(O)C>[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][N:9]2[CH2:13][CH2:12][NH:11][C:10]2=[C:14]([N+:15]([O-:17])=[O:16])[CH2:18][S:20][CH2:21][Si:22]([CH3:25])([CH3:24])[CH3:23])=[CH:4][CH:3]=10.5 g of 1-(6-chloro-3-pyridylmethyl)-2-nitromethyleneimidazolidine, 0.18 g of 37% formaldehyde aqueous solution and 0.24 g of mercaptomethyl trimethylsilane were added to 15 ml of ethanol, and were reacted under reflux for 1 hour. After completing the reaction, the reaction liquor was cooled by ice to precipitate a crystal. The crystal thus precipitated was taken out by filtration, and was washed with a cold ethanol to obtain 0.3 g of the aimed product (Compound No. 20) having a melting point of from 162.3° to 164.3° C.
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