The structure of [SnMe3O2C(CH2)(3)CO2SnMe3](n) or {[Sn-2(CH3)(6)(C5H6O4)]}(n) consists of an infinite layer containing pentacoordinate Sn atoms. There are two formula units, A and B, in the asymmetric unit. Glutarate acts as a tetradentate bridging ligand, each glutarate being linked to four different Sn atoms, generating two-dimensional sheets. One ligand links the Sn atoms of unit A, the other the Sn atoms of unit B. The sheets are parallel to each other.
Boye, M. S., Diasse-Sarr, A., Molloy, K. C., Kociok-Koehn, G., & Mahieu, B. (2007). Poly[bis(trimethyltin)-mu-glutarato]. Acta Crystallographica Section E-structure Reports Online, 63, M1724-M1726. https://doi.org/10.1107/S1600536807023926 (Original work published 2007)