Stabilization of the [C 2 N 5 ] 7– Anion in Recoverable High-Pressure Eu 4 Fe 0.864(6) (C 2 N 5 ) 2 Pyronitridocarbonate - Fariia Iasmin Akbar; Nityasagar Jena; Christian Tobeck; Pascal L. Jurzick; Niko T. Flosbach; Valerio Cerantola; Elena Bykova; Lukas Brüning; Andrey Aslandukov; Dominik Spahr; Valentin Kovalev; Gaston Garbarino; et al. (Journal of the American Chemical Society, 2026)