[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH:11]([C:12]3[CH:17]=[CH:16][C:15]([O:18][CH2:19][CH2:20][CH2:21][CH2:22]I)=[CH:14][CH:13]=3)[CH:10]([CH2:24][CH2:25][CH:26]([C:28]3[CH:33]=[CH:32][C:31]([F:34])=[CH:30][CH:29]=3)[OH:27])[C:9]2=[O:35])=[CH:4][CH:3]=1.[CH3:36][NH:37][CH2:38][CH2:39][S:40]([OH:43])(=[O:42])=[O:41].C(=O)([O-])[O-].[K+].[K+]>CO.O>[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:9](=[O:35])[CH:10]([CH2:24][CH2:25][CH:26]([C:28]3[CH:33]=[CH:32][C:31]([F:34])=[CH:30][CH:29]=3)[OH:27])[CH:11]2[C:12]2[CH:17]=[CH:16][C:15]([O:18][CH2:19][CH2:20][CH2:21][CH2:22][N:37]([CH3:36])[CH2:38][CH2:39][S:40]([OH:43])(=[O:42])=[O:41])=[CH:14][CH:13]=2)=[CH:4][CH:3]=164.5 mg of 1-(4-fluorophenyl)-3-[3-(4-fluorophenyl)-3-hydroxypropyl]-4-[4-(4 iodobutoxy)phenyl]azetidin-2-one are dissolved in 3 ml of methanol. 60.7 mg of 2-methylaminoethanesulfonic acid are then dissolved in 1 ml of water, and 30.4 mg of potassium carbonate are added. The reaction solution is stirred at 50° C. for 8 h. After concentration using a rotary evaporator at 40° C., the residue is passed over a reverse-phase cartridge (methanol). The resulting crude product is dissolved in hot methanol. The precipitate formed on cooling is filtered off, and the mother liquor is concentrated using a rotary evaporator. The product is obtained as an oil.
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