[CH3:1][O:2][N:3]=C1C2C=CN=NC=2OC1.[Cl:13][C:14]1[CH:15]=[C:16]2[C:22](=O)[CH2:21][O:20][C:17]2=[CH:18][N:19]=1>>[CH3:1][O:2][N:3]=[C:22]1[C:16]2[C:17](=[CH:18][N:19]=[C:14]([Cl:13])[CH:15]=2)[O:20][CH2:21]1This compound was prepared using a method analogous to that of furo[2,3-c]pyridazin-5(6H)-one O-methyl oxime (A.2.3.3), 5-chlorofuro[2,3-c]pyridin-3(2H)-one replacing furo[2,3-c]pyridazin-5(6H)-one;
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