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.
Iran first established its nuclear program in 1957, under Mohammad Reza Shah Pahlavi, with an agreement on nuclear cooperation with the United States under the Atoms for Peace program. In 1960, it purchased from the United States a small research reactor, which is located at the Tehran Nuclear Research Center.