Pharmaceutical Chemistry-II offers a comprehensive exploration of medicinal chemistry, focusing on drug synthesis, chemical properties, and structure-activity relationships (SAR) of pharmaceutical compounds. The book bridges key concepts from organic, inorganic, and physical chemistry, highlighting their integral roles in drug discovery and development. Emphasizing the mechanisms of drug action, the physicochemical properties that influence efficacy, and the metabolic pathways that govern drug behavior in the body, this work also delves into advanced analytical techniques for drug identification and purity assessment. It serves as an essential resource for students, researchers, and professionals engaged in pharmaceutical sciences, providing insights into the chemical foundation of drug design, quality control, and therapeutic effectiveness.