N-tert-butyl-N'-[5-cyano-2-(4-methylphenoxy)phenylsulfonyl]urea, a new TXA₂ receptor antagonist.

The title compound, C₁₉H₂₁N₃O₄S, crystallizes in the space group P2/c with two molecules in the asymmetric unit. The conformation of both molecules is very similar and is mainly determined by an intramolecular N-H∙∙∙O hydrogen bond between a urea N atom and a sulfonyl O atom. The O and second N atom of the urea groups are involved in dimer formation via N-H∙∙∙O hydrogen bonds. The intramolecular hydrogen-bonding motif and conformation of the C-SO₂-NH(C=O)-NH-C fragment are explored and compared using the Cambridge Structural Database and theoretical calculations. The crystal packing is characterized by π-π stacking between the 5-cyanobenzene rings.