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Doxorubicin structure has been attached to (urea or thiourea) of 4-amino benzene sulfonamide via carbamate bond for minimizing doxorubicin side effects and reducing tumor resistance. The structures of compounds were characterized by melting point, 1H-NMR spectra, 13C-NMR spectra and UV spectra. Chemical hydrolysis study of compound (IV) in different phosphate buffer (pH 5, 6.5 & 7.4) shows high stability at pH (7.4), and require more acidic condition to hydrolyze. In vitro cytotoxicity assay on MCF-7 has been studied, for compounds II & IV (IC50= 9.57 µg/ml & IC50= 10.28 µg/ml respectively) show significant cytotoxicity compared to free doxorubicin (IC50= 11.14 µg/ml) this may be attributed to the action of conjugated molecule.