Synthetic chemistry plays a critical role in the invention and development of new drugs and pesticides. His involves the formation and synthesis of new composite with selected properties like selectivity, strength, and safety. Moreover, this process starts with the recognition of the leading compound or composite, which can be a chemical-free, natural or completely synthetic composite that indicates an activity without any particular target. It has been observed that medicinal chemists apply this technique of synthetic chemistry for modifying the leading compound with the help of SAR or structure-activity relationship as it helps to optimize its activities, and any kind of pharmacokinetic properties. Along with this, this process involves the formation and combination of analogues of the leading composite with the changes and modifications to the molecular form for improving its properties.