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It comprises five main topics namely: Terpenoids, Chemistry and Biochemical Action of Vitamins, Natural Dyes, Purines Pyrimidines and Nucleic Acids, and Natural Products: Colour Reaction Tests. The original style of presentation has been strictly adhered to in respect of introduction nomenclature classification structures extraction isolation characteristic features constitution and synthesis of certain selected important constituents from Natural Products. A few biosynthetic pathways have also been discussed with proper explanations wherever necessary. Due care has been taken to provide correct chemical structures of various plant constituents based on the Natural Products according to the latest Merck Index so that the end-users and teachers may find it authentic. Appropriate explanations of various courses of sunthctic routes have been explored to render the text matter easily comprehensible as well as convincing. Both M.Sc. Students specializing in Chemistry Biotechnology Biochemistry Pharmaceutical Chemistry Molecular Biology Microbiology and other allied disciplines may find the present textbook a pathfinder. About the Author Ashutosh Kar is a well-known Professorof Pharmaceutical Chemistry and has tohis credit twenty -eight years teaching experience at undergraduate and  postgraduate levels both in Indian universities and abroad. He has published more than fifty research papers in international and national scientific journals. He has taught at School to Pharmacy Addis Ababa University. Professor Kar has an excellent track record in academic institutions of high reptile and actively engaged in teaching research administration and sery ice to his profession. He has to his credit more than fifty research papersand guided several PG/Ph.D. students in Nigeria India and fithiopia. He bagged the university Gold Medal in B. Pharm. And M. Pharma examinations from the university of Saugar Sagar(MP)and completed his PH.D. Professor Kar was conferred with Lifetime Achievement Award by Indian Association of Pharmaceutical Scientists and Technologists Kolkata for his immense contribution in the Indian Pharmacy Profession.