Hydrogen bonding in nitroaniline analogues: a hydrogen-bonded chain of rings in 2-amino-4-butylamino-6-methoxy-5-nitropyrimidine.

In the title compound, C(9)H(15)N(5)O(3), in which the molecules exhibit orientational disorder, the molecules of the major component are linked by paired N-H...O hydrogen bonds [H...O = 2.37 and 2.39 A, N...O = 2.974 (3) and 3.011 (3) A, and N-H...O = 126 and 128 degrees ] to form a C(8)C(8)[R(2)(2)(6)] chain of rings along [010]. The minor component (6.5% of the molecules) forms a similar chain running in the opposite direction.