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- [5] Efficient regioselective synthesis of triheterocyclic compounds:: imidazo[2,1-b]benzothiazoles, pyrimido[2,1-b]benzothiazolones and pyrimido[2,1-b]benzothiazoles JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 2002, (06): : 741 - 745