Thionyl Chloride → 2-(5-nitro-2-thienyl)-1H-benzimidazole

Reaction equation

[N+:1]([C:4]1[S:8][C:7]([C:9]2[NH:13][C:12]3[CH:14]=[CH:15][CH:16]=[C:17](C(O)=O)[C:11]=3[N:10]=2)=[CH:6][CH:5]=1)([O-:3])=[O:2].S(Cl)(Cl)=[O:22].[NH2:25][CH:26]([CH3:36])[CH:27]([C:29]1[CH:34]=[CH:33][C:32](Cl)=[CH:31][CH:30]=1)[OH:28]>O1CCCC1>[N+:1]([C:4]1[S:8][C:7]([C:9]2[NH:13][C:12]3[CH:14]=[CH:15][CH:16]=[CH:17][C:11]=3[N:10]=2)=[CH:6][CH:5]=1)([O-:3])=[O:2].[OH:22][CH2:36][CH:26]([NH-:25])[CH:27]([OH:28])[C:29]1[CH:34]=[CH:33][C:32]([N+:1]([O-:3])=[O:2])=[CH:31][CH:30]=1