In present work, the sulfonamide compound, 3-chloro-N-(4-sulfamoylphenethyl)propanamide, has been synthesized and characterized by FT-IR, H-1-NMR, C-13-NMR, UV-vis and X-Ray single crystal determination. The compound crystallizes in the monoclinic space group P2(1)/c with a = 8.4493(4) angstrom, b = 17.5875(7) angstrom, c = 9.2593(4) angstrom and beta = 103.579(4)degrees, and Z = 4 in the unit cell. The molecular geometry from X-ray experiment in the ground state and vibrational frequencies, H-1 and C-13-NMR chemical shifts, absorption wavelengths have been calculated by using the Density Functional Theory (DFT) method with 6-311++G(d,p) basis set and compared with the experimental values. In addition, Molecular Electrostatic Potential (MEP), Natural Bond Orbital (NBO), Frontier Molecular Orbital (FMO) analysis, thermodynamic properties, dipole moments, and HOMO-LUMO energy were also computed. The calculated results show that the optimized geometry can well reproduce the crystal structure parameters, and the vibrational frequencies, H-1 and C-13-NMR chemical shifts, absorption wavelengths are in agreement with experimental values. Further, the synthesized compound was evaluated for in vitro cytotoxic activity against various tumour cells and normal cell line using MTT assay. The synthesized compound show the highest antiproliferative effect against ECC-1 tumour cells (IC50 = 0,167 mM), while the lowest cytotoxic activity against normal cell (HEK-293 and PNT1A) cell line (IC50 = 0.603 and 0.696 mM, respectively). (C) 2016 Elsevier B.V. All rights reserved.