Figure shows 11, the only three-dimensionally connected polymer in this study. This material can be viewed as an NN↔HCN substituted analogue of cubic gauche nitrogen -a metastable allotrope of nitrogen synthesized above 42 GPa. Structure 11 has been predicted to be dynamically stable (a minimum on the potential energy surface). (11). Left: color representations: carbonbrown, hydrogen -pink and nitrogen -grey.