[Cl:1][C:2]1[CH:10]=[C:9]([F:11])[C:8]([N:12]2[C:17](=[O:18])[C:16]3[CH2:19][CH2:20][CH2:21][C:15]=3[N:14]([CH3:22])[C:13]2=[O:23])=[CH:7][C:3]=1[C:4]([O-:6])=[O:5].[Na+].[CH3:25][O:26][CH2:27]Cl>>[Cl:1][C:2]1[CH:10]=[C:9]([F:11])[C:8]([N:12]2[C:17](=[O:18])[C:16]3[CH2:19][CH2:20][CH2:21][C:15]=3[N:14]([CH3:22])[C:13]2=[O:23])=[CH:7][C:3]=1[C:4]([O:6][CH2:25][O:26][CH3:27])=[O:5]using sodium 2-chloro-4-fluoro-5-(1,2,4,5,6,7-hexahydro-1-methyl-2,4-dioxo-3H-cyclopenta[d]pyrimidin-3-yl)-benzoate and chlorodimethyl ether there is obtained methoxymethyl 2-chloro-4-fluoro-5-(1,2,4,5,6,7-hexahydro-1-methyl-2,4-dioxo-3H-cyclopenta[d]pyrimidin-3-yl)-benzoate, 1H-NMR (CDCl3, 400 MHz) 7.93 ppm (d, 1H), 7.36 ppm (d, 1H), 5.45 ppm (s, 2H), 3.54 ppm (s, 3H), 3.41 ppm (s, 3H), 2.95 ppm (m, 2H), 2.81 ppm (m, 2H), 2.17 ppm (m, 2H),
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