Classical Packing and Stacking in 6-Phenyl-5-azauracil

Although probably not incorporated directly into nucleic acids, the title compound, 6-phenyl-1,3,5-triazine-2,4(1H,3H)-dione (C₉H₇N₃O₂), resembles the pyrimidine bases in such nucleic acids. In the solid state, molecules base pair about a centre of symmetry into a dimer arrangement along the a axis and are linked firmly in the c direction by an N1—H1...O4 interaction related by the glide plane. The remaining intermolecular forces are achieved by the alternate stacking of phenyl and triazine rings in columns along the b axis.

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