2-Amino-4-chloro-6-[N-methyl-N-(4-methylphenyl)amino]pyrimidine: formation versus fragmentation of hydrogen-bonded chains of edge-fused R(2)2(8) rings in 4,6-disubstituted 2-aminopyrimidines.

Molecules of the title compound, C(12)H(13)ClN(4), are linked by two independent N-H...N hydrogen bonds into a chain of edge-fused R(2)(2)(8) rings. The significance of this study lies in its attempt to rationalize the patterns of supramolecular aggregation in the title compound and in a range of analogous 4,6-disubstituted 2-aminopyrimidines.