Nitrogen- and oxygen-rich organic material indicative of polymerization in pre-aqueous cryochemistry on Bennu's parent body. - Sandford SA; Gainsforth Z; Nuevo M; Marcus MA; Bechtel HA; Ogliore RC; Jones C; Dominguez G; Glavin DP; Dworkin JP; McCoy TJ; Russell SS; et al. (Nature astronomy, 2025)