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Synthesis of new six and five membered heterocyclic compounds including oxygen and nitrogen was reported and following compounds were synthesized: 1.Synthesis of novel tetrahydrobenzo 4,5]imidazo 2,1-b]chromeno 4,3,2-de]quinazoline 3 and benzothiazole-2-ylamino-xanthenone derivatives 5; 2. Synthesis of different pyrano-pyrazole derivatives 4 and 5; 3. Synthesis of benzo 4,5]imidazo 1,2-a]chromeno 4,3-d]pyrimidine-6-one 6, triazolo 1,5-a]pyrimidin-5-one 7 and pyrido 2,3-d]pyrimidine-2,4,7-trione derivatives 8; 4. Synthesis of benzochromeno-pyrazole derivatives 5 and 6; 5. Synthesis of...