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Top: (A) Peak assignment of the benzophenone bis-urea macrocycle, which self-assembles to form 1. (B) XRD structure of 1 depicting the encapsulated DMSO (space fill), the assembly of 1 promotes the formation of a stable radical upon UV irradiation. Bottom: CP MAS NMR spectra of thermally polarized 1 recorded at a spinning speed of 11.3 kHz. (I) no UV, (II) 2 h. UV and (III) 4 h. UV.
