[I:1][C:2]1[C:7]2[C:8](=[O:19])[C:9]3[CH:16]=[CH:15][CH:14]=[C:13]([CH2:17][OH:18])[C:10]=3[CH2:11][CH2:12][C:6]=2[CH:5]=[CH:4][CH:3]=1>[O-2].[O-2].[Mn+4]>[I:1][C:2]1[C:7]2[C:8](=[O:19])[C:9]3[CH:16]=[CH:15][CH:14]=[C:13]([CH:17]=[O:18])[C:10]=3[CH2:11][CH2:12][C:6]=2[CH:5]=[CH:4][CH:3]=1150 mg of the mixture of 6-iodo-5-oxo-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-1-ylmethanol and 4-iodo form prepared in Example 6-a was oxidized by the procedure of Example 1-f using manganese dioxide, to give 120 mg of a mixture of the title compound with a 4-iodo form as a colorless powder.
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