Isomerism is the phenomenon whereby certain compounds, with the same molecular formula, exist in different forms owing to their different organisations of atoms. The concept of isomerism illustrates the fundamental importance of molecular structure and shape in organic chemistry.
By signing the nuclear deal, Iran has given up that nuclear umbrella for as long as two decades and made the case for the United States to further strengthen the conventional military capacities of Israel and the GCC.
The ministers of foreign affairs of France, Germany, the European Union, Iran, the United Kingdom and the United States as well as Chinese and Russian diplomats announcing the framework for a Comprehensive agreement on the Iranian nuclear program (Lausanne, 2 April 2015).