2,4-Diamino-6-methyl-1,3,5-triazin-1-ium trifluoroacetate.

Crystals of the title compound, C(4)H(8)N(5)+.C(2)F(3)O(2)-, are built up of singly protonated 2,4-diamino-6-methyl-1,3,5-triazin-1-ium cations and trifluoroacetate anions. The CF(3) group of the anion is disordered. The oppositely charged ions interact via almost linear N-H...O hydrogen bonds, forming a CF(3)COO-...C(4)H(8)N(5)+ unit. Two units related by an inversion centre interact through a pair of N-H...N hydrogen bonds, forming planar (CF(3)COO-...C(4)H(8)N(5)+...C(4)H(8)N(5)+.CF(3)COO-) aggregates that are linked by a pair of N-H...O hydrogen bonds into chains running along the c axis.