Cl.[S:2]1[CH:6]=[CH:5][CH:4]=[C:3]1[CH2:7][CH2:8][NH:9][CH:10]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[Cl:20])[C:11]([NH2:13])=[O:12].O.[OH-].[Na+]>ClCCCl>[S:2]1[CH:6]=[CH:5][CH:4]=[C:3]1[CH2:7][CH2:8][NH:9][CH:10]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[Cl:20])[C:11]([NH2:13])=[O:12]24.8 g (0.075 mol) of [2-(2-thienyl)ethylamino](2-chlorophenyl)acetamide hydrochloride, prepared according to example 5 or 6, is mixed with 170 ml of water, then under mild cooling 30 ml of 10% sodium hydroxide solution and 170 ml of 1,2-dichloroethane are added. The phases are separated, the aqueous phase is extracted with 2×20 ml of 1,2-dichloroethane, the combined organic layer is evaporated in vacuo. Residue: 22 g, fast crystallizing oil. The raw product is recrystallized from 80 ml of isopropyl acetate to give 19.5 g of the crystalline base of formula (VII). Yield: 88.2%, mp.: 90-92° C.
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