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Medicinal chemistry by Ashutosh Khar is one of the best book for Pharma students.
This extremely successful textbook emphasizes the fundamentals of medicinal chemistry with specific reference to drug design, drug synthesis, and drug action from a pharmaceutical organic chemical perspective. Thus, it really enables the reader to extend knowledge beyond what is known with regard to several known classes of drug molecules. Particular care has been taken to preserve the organization, presentation, and rhythm of the fourth edition.