[C:1]1([N:7]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[C:8]([NH2:10])=[S:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.Br[CH2:18][C:19](=O)[C:20]([O:22][CH2:23][CH3:24])=[O:21]>C(O)C>[C:1]1([N:7]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[C:8]2[S:9][CH:18]=[C:19]([C:20]([O:22][CH2:23][CH3:24])=[O:21])[N:10]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1The reaction described in Preparation 42 was repeated, but using 20 g of 1,1-diphenylthiourea, 19 g of ethyl bromopyruvate and 200 ml of ethanol, giving the title compound as an orange oil.
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