[Cl:1][C:2]1[CH:12]=[CH:11][C:10]([N:13]2[C:18](=[O:19])[C:17]3[CH2:20][CH2:21][CH2:22][C:16]=3[N:15]([CH3:23])[C:14]2=[O:24])=[CH:9][C:3]=1[C:4]([O:6][CH2:7]C)=[O:5].[Na].ClC1C=CC(N2C(=O)C3CCCCC=3N(C)C2=O)=CC=1C(O)=O.CI>>[Cl:1][C:2]1[CH:12]=[CH:11][C:10]([N:13]2[C:18](=[O:19])[C:17]3[CH2:20][CH2:21][CH2:22][C:16]=3[N:15]([CH3:23])[C:14]2=[O:24])=[CH:9][C:3]=1[C:4]([O:6][CH3:7])=[O:5]using ethyl 2-chloro-5-(1,2,4,5,6,7-hexahydro-1-methyl-2,4-dioxo-3H-cyclopenta[d]pyrimidin-3-yl)-benzoate via the sodium salt of the corresponding carboxylic acid and methyl iodide there is obtained methyl 2-chloro-5-(1,2,4,5,6,7-hexahydro-1-methyl-2,4-dioxo-3H-cyclopenta[d]pyrimidin-3-yl)-benzoate, m.p. 164°-166° C.,
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