Diethyl Oxalate → Ethyl 4-(hydroxyimino)-3-methyl-2-oxo-4-(thiophen-2-yl)butanoate

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[C:19]([C:20]([O:22][CH2:21][CH3:23])=[O:24])(=[O:25])[O:26][CH2:27][CH3:28].[CH2:29]1[O:30][CH2:31][CH2:32][CH2:33]1.[CH3:12][CH:13]([N-:14][CH:15]([CH3:16])[CH3:17])[CH3:18].[Li+:11].[s:1]1[c:2]([C:6]([CH2:7][CH3:8])=[N:9][OH:10])[cH:3][cH:4][cH:5]1>>[s:1]1[c:2]([C:6]([CH:7]([CH3:8])[C:20]([C:19](=[O:25])[O:26][CH2:27][CH3:28])=[O:22])=[N:9][OH:10])[cH:3][cH:4][cH:5]1