Guanidinium phenyl­arsonate–guanidine–water (1/1/2)

In the structure of the title compound, CH(6)N(3) (+)·C(6)H(6)AsO(3) (−)·CH(5)N(3)·2H(2)O, the phenyl­arsonate anion participates in two R (2) (2)(8) cyclic hydrogen-bonding inter­actions, one with a guanidinium cation, the other with a guanidine mol­ecule. The anions are also bridged by the water mol­ecules, one of which completes a cyclic R (5) (3)(9) hydrogen-bonding association with the guanidinum cation, conjoint with one of the three R (2) (2)(8) associations about that ion, as well as forming an R (2) (1)(6) cyclic association with the guanidine mol­ecule. The result is a three-dimensional framework structure.