Four organotin complexes (C1–C4) were synthesized by microwave and characterized by elemental analysis, IR, Vis-UV, ~1H NMR, ~(13)C NMR, ~(119)Sn NMR, HRMS, X-ray single crystal diffraction, and thermogravimetric analysis. The structural analysis showed that complexes C1–C4 are centrosymmetric dimer structure with a four-membered central endo-cyclic Sn_2O_2 unit. The inhibitory activities of C1–C4 aganist cancer cells (NCI-H460, HepG2, MCF7) and normal human liver cell (HL7702) were tested by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tet...