[CH2:1]([CH:8]1[C:12](=[O:13])[N:11]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[N:10]([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[C:9]1=[O:26])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[OH:27]O>C(O)(=O)C>[CH2:1]([C:8]1([OH:27])[C:9](=[O:26])[N:10]([C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=2)[N:11]([C:14]2[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=2)[C:12]1=[O:13])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Prepared from 4-benzyl-1,2-diphenyl-3,5-pyrazolidinedione (3.3 g; 9.6 mmol), 35% H2O2 (1.4 ml; 16.3 mmol), and acetic acid (50 ml) using the procedure of Example 10 to give 1.0 g (30%).
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