The present invention relates to novel fused Imidazobenzothiazole derivatives, their pharmaceutically acceptable salts, and their isomers, steroisomers, atropisomers, conformers, tautomers, polymorphs, hydrates, solvates and N-oxide. The present invention also encompasses pharmaceutically acceptable compositions of said compounds and process for preparing novel compounds. The invention further relates to the use of the above-mentioned compounds for the preparation of medicament for use as pharmaceuticals.