density functional and ab initio calculations, EPR spectroscopy, fused thiophene, nitronyl nitroxides, π-stacking, DNA-PK, COMPLEXES, EX-SITU GENERATION, OXIDATIVE ADDITION, density functional and ab into calculations, pi-stacking, CARBON-MONOXIDE, PALLADIUM-CATALYZED CARBONYLATION, ARYL HALIDES, ANTIPLATELET ACTIVITY, AMINOCARBONYLATION, CO SOURCE