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About author : Ramesh Dhani Dept. of  Pharmaceutical Chemistry JNTUA-OTRI, Anantapur, India E-mail: dhanipharmachem@gmail.com ABSTRACT: A great number of drugs are heterocyclic compounds, mostly are of synthetic origin, few have obtained from natural resources which include alkaloids, xanthines, cardiac glycosides, vitamins and several antibiotics. Heterocyclic derivatives having two nitrogen atoms oriented in, 1-3 position are endowed with wide spectrum of ... Read More »