[CH3:1][CH:2]([C:4]1[S:20][C:7]2[N:8]=[C:9]3[CH:16]=[CH:15][C:14]([C:17](O)=[O:18])=[CH:13][N:10]3[C:11](=[O:12])[C:6]=2[CH:5]=1)[CH3:3].C(N1C=CN=C1)(N1C=CN=C1)=O.O.[NH2:34][C:35]1[NH:39][N:38]=[N:37][N:36]=1>CN(C)C=O>[CH3:3][CH:2]([C:4]1[S:20][C:7]2[N:8]=[C:9]3[CH:16]=[CH:15][C:14]([C:17]([NH:34][C:35]4[NH:39][N:38]=[N:37][N:36]=4)=[O:18])=[CH:13][N:10]3[C:11](=[O:12])[C:6]=2[CH:5]=1)[CH3:1]2.88 g (0.01 mol) of 2-(1-methylethyl)-4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidin-7-carboxylic acid (Example 18) and 3.31 g (0.02 mol) of 1,1' carbonyldiimidazole (Aldrich Chemical Company) in 100 ml of dimethylformamide are stirred and heated in a wax bath at 105° C. for ninety minutes under nitrogen. The mixture is cooled and stirred at room temperature for thirty minutes and 1.03 g (0.01 mol) of 5-aminotetrazole monohydrate (Aldrich Chemical Company) is added and the resulting mixture is stirred and heated at 105° C. for one hundred thirty-five minutes under nitrogen. The mixture is allowed to stand overnight at room temperature, the precipitate is filtered and the filtrate is evaporated in vacuo. The residue is slurried in boiling methanol, the mixture cooled and filtered. This precipitate is combined with the previous precipitate to give 1.8 g of 2-(1-methylethyl)-4-oxo-N-1H-tetrazol-5-yl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7 -carboxamide; mp 307° C. (dec) after recrystallization from pyridine.
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