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In the title adduct, 3C 13 H 9 N·C 9 H 6 O 6  or (acr) 3 (btc), associ­ations of one btc and three acr molecules linked by O—H⋯N hydrogen bonds occur. C—H⋯O interactions also occur, resulting in a cyclic hydrogen-bonded synthon  R21 (6). The acr mol­ecules and the btc mol­ecules also form slipped or offset π–π stacking inter­actions [centroid–centroid distances of 3.5212 (17) Å for btc rings and 3.703 (2) and 3.731 (2) Å for acr rings]. Together these inter­actions lead to a three-dimensional network.

Acridine–benzene-1,3,5-tricarboxylic acid (3/1)