Compound 5

potassium [(1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene)(2,3,5,6-tetramethylphenyl)boryl(amide)] radical dimer

From: One-pot, room-temperature conversion of dinitrogen to ammonium chloride at a main-group element