catena-Poly[[dichloridodimethyl­tin(IV)]-μ-5-methyl­pyrazine-2-carboxyl­ato-κ3 O: O′, N-[dimethyl­tin(IV)]]-μ-5-methyl­pyrazine-2-carboxyl­ato-κ3 O, N: O′].

The title compound, [Sn2Cl2(CH3)4(C6H5N2O2)2], forms infinite one-dimensional zigzag chains that propagate in a helical fashion along the c axis via an Sn—O=C—O—Sn—O bridge which involves the carboxyl­ate groups of two methyl­pyrazine­carboxyl­ate ligands. These display both chelating and bridging coordination behaviour. The asymmetric unit contains two Sn atoms; one adopts a distorted trigonal–bipyramidal geometry, while the other is in a distorted penta­gonal–bipyramidal configuration. [ABSTRACT FROM AUTHOR]