[CH3:1][S:2][CH2:3][C:4]1[N:8]=[C:7]([CH2:9][N:10]2[C:15]3[CH:16]=[C:17]([C:19]4[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=4)[S:18][C:14]=3[C:13](=[O:25])[N:12]([CH:26]3[CH2:31][CH2:30][N:29](C(OC(C)(C)C)=O)[CH2:28][CH2:27]3)[C:11]2=[O:39])[O:6][N:5]=1.[ClH:40]>C(Cl)Cl.O1CCOCC1>[ClH:40].[CH3:1][S:2][CH2:3][C:4]1[N:8]=[C:7]([CH2:9][N:10]2[C:15]3[CH:16]=[C:17]([C:19]4[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=4)[S:18][C:14]=3[C:13](=[O:25])[N:12]([CH:26]3[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]3)[C:11]2=[O:39])[O:6][N:5]=1A solution of tert-butyl 4-[1-({3-[(methylsulfanyl)methyl]-1,2,4-oxadiazol-5-yl}methyl)-2,4-dioxo-6-phenyl-1,4-dihydrothieno[3,2-d]pyrimidin-3(2H)-yl}piperidine-1-carboxylate (715 mg; compound B11) in DCM (15 ml) is reacted with a solution of hydrogen chloride in 1,4-dioxane (3 ml, 4.0 M) according to the procedure described in example B28 to afford the title compound as a solid.
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