1-Dimethyl­ammoniomethyl-6,8-dimethyl-2-phenyl-1,2-dihydro­imidazo[1,2- a][1,8]naphthyridine picrate monohydrate.

In the title salt, C21H23N4+·C6H2N3O7−·H2O, the dimethyl­ammonio­methyl side chain is oriented nearly perpendicular to the imidazonaphthyridine moiety, which is nearly planar. In the crystal structure, inter­molecular N—H⋯O and O—H⋯O hydrogen bonds link two cations, two anions and two water mol­ecules into clusters, which further inter­act via weak C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]