A novel ionic organotin compound {[Ph~2Sn]~2[2, 6-Py(CO~2)]~3H~2O}^2^-[HNEt~3]^+~2 was synthesized by the reaction of Ph~3SnCl with 2, 6-pyridine dicarboxylic acid in 1:1 molar ratio in the presence of an organic base Et~3N. The structure was characterized b elemental analysis, IR and ^1H NMR. The crystal structure was determined by X-ray single crystal diffraction. The crystal belongs to monoclinic with space group P2~1/n, a=1.7073(7) nm, b=1.7447(7) nm, c=2.5333(10) nm, β=109.694(7)°, Z=4, V=6.824(5) nm^3, D~c=1.282 g/cm^3, μ=0.793 mm^-^1, F(000)=2696, R~1=0.0563, WR~2=0.1539. In the crystal structure of the compound, the tin atoms are seven-coordinated in a distorted pengonal bipyramidal geometry. The compound was tested in vitro against human tumour cell lines, MCF-7 and WiDr, and displayed high activity.

Key words: IONS, BIOLOGICAL ACTIVITY, ORGANO TIN COMPOUNDS, PYRIDINEDICARBOXYLIC ACID P, SYNTHESIS, CRYSTAL STRUCTURE