[en] The title compound, 3-(2,4-dichlorophenyl)-2-phenyl-5-(p-tolyl)- 7-(trifluoromethyl)pyrazolo[1,5-a] pyrimidine (C/sub 26/H/sub 16/Cl/sub 2/F/sub 3/N/sub 3/, Mr = 498.32) has been synthesized by condensation of 4,4,4-trifluoro-1-(p-tolyl)butane- 1,3-dione with 4-(2,4-dichlorophenyl)-3-phenyl-1H-pyrazol-5-amine. The latter was prepared from 2,4-dichlorophenylaceton itrile and ethyl benzoate through Claisen condensation and then cyclization with hydrazine hydrate. The crystal structure of the title compound was determined. In addition, the title compound possesses marked inhibition against the proliferation of human lung adenocarcinoma cell line A549 and human gastric cancer cell line MKN45, displaying promising anticancer activities. (author)