Fig. (2) 105 K DNP enhanced natural abundance 13C (left column) and 15N (right column) CPMAS solid-state NMR spectra of (A) crystalline cetirizine dihydrochloride (A), (B) amorphous cetirizine dihydrochloride (A), (C) povidone (P), (D) “LIFE” brand formulation (F1), (E) “CVS” brand formulation (F2), (F) “Reactine” brand formulation (F3), and (G) “Wal-Zyr” brand formulation (F4) impregnated with TCE solutions of TEKPol. "Reprinted (adapted) with permission from [9]. Copyright (2015) American Chemical Society."