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The asymmetric unit of the title co-crystal, C 12 H 9 N 5 O·C 7 H 6 O 3 , contains one mol-ecule of N  6 -benzoyl-adenine (BA) and one mol-ecule of 4-hy-droxy-benzoic acid (HBA). The N  6 -benzoyl-adenine (BA) has an N(7)-H tautomeric form with nonprotonated N-1 and N-3 atoms. This tautomeric form is stabilized by a typical intra-molecular N-H⋯O hydrogen bond between the carbonyl (C=O) group and the N(7)-H hydrogen on the Hoogsteen face of the purine ring, forming a graph-set S (7) ring motif. The primary robust R  2  2 (8) ring motif is formed in the Watson-Crick face via N-H⋯O and O-H⋯N hydrogen bonds (involving N1, N6-H and the carboxyl group of HBA). Weak inter-actions, such as, C-H⋯π and π-π are also observed in this crystal structure.

acta crystallographica. section e, crystallographic communications

Supramolecular hydrogen-bonding patterns in a 1:1 co-crystal of the N(7)—H tautomeric form of<i>N</i><sup>6</sup>-benzoyladenine with 4-hydroxybenzoic acid

Supramolecular hydrogen-bonding patterns in a 1:1 co-crystal of the N(7)—H tautomeric form ofN6-benzoyladenine with 4-hydroxybenzoic acid

Supramolecular hydrogen-bonding patterns in a 1:1 co-crystal of the N(7)—H tautomeric form ofN⁶-benzoyladenine with 4-hydroxybenzoic acid