[CH:1]1[C:9]2[C:8]3C=CC=C[C:7]=3[O:6][C:5]=2[CH:4]=[CH:3][CH:2]=1.[Cl:14][CH2:15][CH2:16][C:17](Cl)=[O:18]>>[Cl:14][CH2:15][CH2:16][C:17]([C:7]1[O:6][C:5]2[CH:4]=[CH:3][CH:2]=[CH:1][C:9]=2[CH:8]=1)=[O:18]Using dibenzofuran and 3-chloropropionyl chloride, the same procedure as in Reference Example 2 was followed, to yield the title compound as a colorless crystal having a melting point of 116° to 118° C.
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