The title compound, C 27 H 25 Cl 2 N 3 , is an unexpected but high-yield product from the microwave-mediated reaction between 3- tert -butyl- N -4-chlorobenzyl-1-phenyl-1 H -pyrazol-5-amine and 4-chlorobenzaldehyde. Inversion-related pairs of molecules are linked by C—H...π(arene) hydrogen bonds to form cyclic centrosymmetric dimers, and dimers of this type are linked into sheets by two independent π–π stacking interactions.