N <br /> C <br /> N <br /> 0 <br /> 0 <br /> 0 <br /> O <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0) <br /> a <br /> 0 <br /> U <br /> cD <br /> a <br /> 0) <br /> 0 <br />