The 1:1 adduct of hexamethylenetetramine (HMT) with racemictrans-1,2-cyclohexanedicarboxylic acid (CDA)

Hexa­methyl­ene­tetramine and rac-trans-1,2-cyclo­hexane­di­carboxylic acid crystallize in a 1:1 ratio as a neutral molecular adduct, C6H12N4·C8H12O4. Two di­carboxylic acid mol­ecules and two tetr­amine mol­ecules form a hydrogen-bonded ring, in the shape of a rhombus, which lies on a crystallographic twofold axis bisecting the two diacid mol­ecules. The O—H⋯N hydrogen bonds have lengths 2.6808 (19) and 2.6518 (19) Å, and, in each ring, both acid mol­ecules have the same handedness.